This was CNBC's live blog tracking developments on the war in Ukraine on March 14, 2023. See here for the latest updates.

Ukraine's President Volodymyr Zelenskyy insisted his forces must win the battle for Bakhmut in Donetsk, eastern Ukraine, as doubts continue over whether Ukraine should spend more manpower and resources on defending the besieged city in Donetsk.

"As always, today I was in touch with our commanders, with intelligence [officers]. It is very hard in the east — very painful," Zelenskyy said in his nightly address.

"We must destroy the enemy's military power - and we will destroy it," he said, adding that the defense of settlements big and small, such as Bilohorivka and Avdiivka or Bakhmut and Vuhledar, could determine what Ukraine's future looks like.

There are doubts over the merits of defending Bakhmut, a city said to be almost completely surrounded by Russian forces and mercenary units.

Ukrainian military analyst Oleh Zhdanov said Ukraine was suffering losses among reserves it intended to use in planned counteroffensives against Russian forces, expected in late spring.

Putin rejects theory about Ukrainian role in pipeline blasts

Russian President Vladimir Putin on Tuesday dismissed as "sheer nonsense" allegations that Ukrainians could be behind the blasts that damaged the Nord Stream gas pipelines in the Baltic Sea last year, and again pointed the finger at the U.S.

Putin spoke after The New York Times, The Washington Post and German media published stories last week citing unidentified U.S. and other officials as saying there was evidence Ukraine, or at least Ukrainians, may have been responsible. The Ukrainian government has denied involvement.

Germany's Die Zeit newspaper and German public broadcasters ARD and SWR reported that investigators believed five men and a woman used a yacht hired by a Ukrainian-owned company in Poland to carry out the attack. German federal prosecutors confirmed that a boat was searched in January but have not confirmed the reported findings.

Putin rejected the notion as "sheer nonsense."

"Such an explosion, so powerful and at such depth, could only be conducted by experts backed by the entire potential of a state that has relevant technologies," he said in televised remarks.

— Associated Press

U.S. turns to new ways to punish Russian oligarchs for the war

The U.S. has begun an aggressive new push to inflict pain on Russia's economy and specifically its oligarchs with the intent of thwarting the Kremlin's invasion of Ukraine.

From the Treasury Department to the Justice Department, U.S. officials will focus on efforts to legally liquidate the property of Russian oligarchs, expand financial penalties on those who facilitate the evasion of sanctions, and close loopholes in the law that allow oligarchs to use shell companies to move through the U.S. financial system.

Andrew Adams, who heads the U.S. government's KleptoCapture task force, designed to enforce the economic restrictions within the U.S. imposed on Russia and its billionaires, told The Associated Press that the group is prioritizing its efforts to identify those who help Russians evade sanctions and violate export controls.

"These illicit procurement networks will continue to take up an ever-increasing amount of our bandwidth," said Adams, who also serves as acting deputy assistant attorney general.

So far, more than $58 billion worth of sanctioned Russians' assets have been blocked or frozen worldwide, according to a report last week from the Treasury Department. That includes two luxury yachts each worth $300 million in San Diego and Fiji, and six New York and Florida properties worth $75 million owned by sanctioned oligarch Viktor Vekselberg.

— Associated Press

Russia denies that its aircraft came into contact with the U.S. drone

Russia's Ministry of Defense said its two fighter aircraft did not come in contact with a U.S. drone operating over the Black Sea.

Russia said in a statement posted on its official Telegram channel that the drone was flying with its transponders off near the Crimean Peninsula when it went into "unguided flight" and then fell into the water.

State Department spokesman Ned Price said the U.S. was in the process of summoning Russia's Ambassador Anatoly Antonov to discuss the "brazen violation of international law."

"We have engaged at high levels with our allies and partners in the first instance, to brief them on this incident and to let them know what we know," Price said on a conference call with reporters.

"We are engaging directly with the Russians again at senior levels to convey our strong objections to this unsafe unprofessional intercept, which caused the downing of the unmanned U.S. aircraft," he added.

— Amanda Macias

Russian jet downs U.S. Reaper drone over Black Sea

A Russian fighter jet downed a U.S. drone operating over the Black Sea on Tuesday, U.S. European Command said in a statement.

"Our MQ-9 aircraft was conducting routine operations in international airspace when it was intercepted and hit by a Russian aircraft, resulting in a crash and complete loss of the MQ-9," said U.S. Air Force Gen. James Hecker, commander of U.S. Air Forces Europe and Air Forces Africa.

Prior to the collision, two Russian aircraft harassed the drone, he said.

"Several times before the collision, the Su-27s dumped fuel on and flew in front of the MQ-9 in a reckless, environmentally unsound and unprofessional manner," the statement added.

The MQ-9 Reaper system is designed to collect intelligence and carry out reconnaissance missions and is manufactured by General Atomics Aeronautical Systems.

The remotely piloted system can carry a combination of Hellfire missiles, Joint Direct Attack Munitions, and Laser Joint Direct Attack Munitions.

— Amanda Macias

Potential Republican presidential candidate Ron DeSantis says protecting Ukraine is not a 'vital' U.S. interest

Florida Gov. Ron DeSantis, a potential Republican presidential candidate, said the ongoing war in Ukraine should not be a top priority for the United States.

"While the U.S. has many vital national interests — securing our borders, addressing the crisis of readiness with our military, achieving energy security and independence, and checking the economic, cultural and military power of the Chinese Communist Party — becoming further entangled in a territorial dispute between Ukraine and Russia is not one of them," DeSantis said in a statement provided to "Tucker Carlson Tonight" on Fox News.

As a member of Congress, DeSantis voted for several defense spending bills that provided U.S. military and intelligence support for Ukraine.

— Amanda Macias

Warsaw may give Ukraine MiG-29 jets in next 4 to 6 weeks, Polish prime minister says

Poland could give Ukraine MiG-29 fighter jets in the coming four to six weeks, Prime Minister Mateusz Morawiecki said, suggesting that Kyiv's allies were moving closer to an agreement on the next step in their military support for the country.

Poland has said it would be prepared to send Soviet-designed MiG-29 jets to Ukraine as part of a coalition of countries. However, with Kyiv's allies taking a cautious approach to the transfer of fighter jets it has been unclear how long such a process might take.

"That could happen in the coming 4-6 weeks," Morawiecki told a news conference when asked how long it could be before Warsaw supplies the aircraft.

Last Thursday Slovak Defence Minister Jaroslav Nad said his Polish counterpart had told him at a European Union meeting on the previous day that Warsaw would agree to a joint process to hand over MiG-29 jets to Ukraine.

Nad said the time had come also for Slovakia to make a decision on whether or not to send jets to Ukraine.

— Reuters

Seven ships leave Ukraine under Black Sea Grain Initiative

Seven ships carrying 265,977 metric tons of grain and other agricultural products left Ukraine's Chornomorsk and Odesa ports Monday.

The ships are destined for Spain, China and the Netherlands and are carrying corn, sunflower meal and sunflower oil.

The Black Sea Grain Initiative, a deal brokered last July between Ukraine, Russia, Turkey and the United Nations, eased Russia's naval blockade and saw three key Ukrainian ports reopen.

So far, more than 700 ships have sailed from Ukrainian ports.

— Amanda Macias

Russia is fighting for the existence of its state, Putin says

Russian President Vladimir Putin has reiterated claims that Russia is involved in a battle for the existence of its own state.

"So for us this is not a geopolitical task, but a task of the survival of Russian statehood, creating conditions for the future development of the country and our children," Putin said, adding that Russia was also fighting in Ukraine for pro-Russian communities in eastern Ukraine, according to comments reported by Reuters.

Speaking during a visit to an aviation factory in the far eastern region of Buryatia, Putin said Russia had tried to mend relations with Ukraine for decades but that "the situation changed" after a pro-Western Ukrainian uprising in 2014, which saw a pro-Kremlin Ukrainian president ousted in an event Russia describes as a "coup d'état."

Putin has frequently claimed that the war in Ukraine was caused by the West trying to meddle in Ukraine and damage Russia. Ukraine and its allies say Russia wants to keep Ukraine in its sphere of influence and to install a pro-Moscow regime in Kyiv.

Asked whether he was concerned last year that the Russian economy could collapse under international sanctions, Putin said he had worried, but he added that Russia's "economic sovereignty" now was a major result of last year. The foundations of Russia's economic stability were "stronger than anyone thought," he added.

Putin said Russia's financial system had got stronger and that Western companies that left Russia last year thought the economy would collapse "but it didn't."

— Holly Ellyatt

Kindergarten damaged in Russian strike on Odesa region

Ukraine's military said a Russian missile attack on the region of Odesa has damaged a kindergarten and private houses.

Ukraine's southern operational command said Russian Su-24 planes (tactical bomber aircraft) had launched four missiles toward the coast around Odesa. The command unit said the missiles were likely to be Kh-31P "anti-radiation" missiles — medium-range supersonic missiles designed to counter air defenses. 

In this case, while the missiles were destroyed over the sea, Ukraine said, "the debris and blast wave damaged a kindergarten on the coast and several private houses around." There were no casualties, the post on Facebook noted. The post included images of debris strewn across a children's nursery.

"The enemy once again reminded that the coast is currently a battle line and extremely dangerous," the military said. CNBC was unable to verify the information in the post.

— Holly Ellyatt

Russian parliament votes to censor criticism of mercenary groups

Russia's lower house of parliament, the State Duma, voted on Tuesday to approve an amendment that would punish those found guilty of discrediting "volunteer" groups fighting in Ukraine, extending a law that censors criticism of Russia's armed forces.

The amendment is seen as a move to "protect" fighters working for the private Wagner Group, a mercenary force, which is leading Russia's campaign for the eastern Ukrainian city of Bakhmut.

The bill needs to be approved by the parliament's upper house before passing to President Vladimir Putin for final approval Wagner founder Yevgeny Prigozhin has welcomed the proposals - an expansion of Russia's wartime censorship measures introduced after Moscow invaded Ukraine.

Prigozhin asked parliament in January to ban negative media reports about his men by amending the criminal code, an idea Duma Speaker Vyacheslav Volodin quickly said he backed.

Under Russia's current laws "discrediting" the army can be punished by up to five years in prison, while spreading knowingly false information about it can attract a 15-year jail sentence.

Russian prosecutors have already opened more than 5,800 cases against people for discrediting the armed forces, the OVD-Info rights group says, while authorities have also used the laws against spreading false information to hand down lengthy jail sentences to long-time Kremlin critics.

— Reuters

Kremlin: Grain deal can't stand on one leg

The Kremlin on Tuesday said the Black Sea grain deal could not "stand on one leg" as Moscow criticised the West for not doing enough to remove obstacles to Russia's own agricultural and fertiliser exports.

Kremlin spokesman Dmitry Peskov said contacts continued over the deal, and that "everybody agrees" an agreement to ease restrictions on Russia should be fulfilled.

— Reuters

6 apartment blocks damaged and 1 person dead in Kramatorsk after missile strike

A missile strike on Kramatorsk, a city near Bakhmut in Donetsk, eastern Ukraine, has damaged six apartment blocks and killed a civilian, Ukrainian officials said Tuesday.

Ukrainian President Volodymyr Zelenskyy said in a Telegram post that a Russian missile had hit the city center.

"Kramatorsk. A Russian missile hit the city center. Six high-rise buildings were damaged. At least three people were injured. One person died. My condolences to the family! Rescue operations are still ongoing," the president said.

"Every strike that takes an innocent life must result in a lawful and just sentence that punishes murder. It will definitely be that way," Zelenskyy added.

— Holly Ellyatt

Kremlin says Russia does not recognise ICC jurisdiction, media report suggests

Russia does not recognise the jurisdiction of the International Criminal Court in The Hague, the TASS news agency quoted Kremlin spokesman Dmitry Peskov as saying on Tuesday.

Peskov was asked about reports the ICC was expected to seek its first arrest warrants against Russian individuals in relation to the conflict in Ukraine shortly.

"We do not recognise this court, we do not recognise its jurisdiction," TASS quoted Peskov as saying.

The prosecutor of the ICC is expected to ask a pre-trial judge to approve issuing warrants against several Russians for the abduction of children from Ukraine to Russia and the targeting of civilian infrastructure in Ukraine, a source with knowledge of the matter told Reuters on Monday.

— Reuters

Russia extends vital grain deal with Ukraine for 60 days, official says

A vital grain export deal between Ukraine and Russia has been extended for 60 days, according to Russia's deputy foreign minister, who was quoted by a Russian news agency.

The deal, known officially as the Black Sea Grain Initiative, has facilitated the export of agricultural products, such as wheat, corn and sunflower oil, from Ukraine via the Black Sea. Early on in the war a blockade on such exports contributed to global food shortages and rising prices.

The grain initiative, brokered by Turkey and the United Nations last July, has enabled millions of tons of agricultural products to be exported from Ukraine, alleviating shortages elsewhere.

On Tuesday, Russia's Deputy Foreign Minister Alexander Grushko was quoted as saying that the deal has been extended on the previous conditions, state news agency Tass reported, but that Russia wanted to ensure all the conditions of the agreement were met.

Moscow has complained that international sanctions on its logistics, insurance and payments industries have continued to impede its own agricultural exports of grain and fertilizers.

Grushko said "Russia will persistently seek to ensure that all obligations under the deal are fulfilled," adding that Russia will "strive to ensure that all those promises, obligations that were given to Russia regarding the implementation of the second track [grain deal], and this is the lifting of all sanctions — direct and indirect — for the supply of agricultural products of the Russian Federation to international global markets, were completed," Tass reported.

— Holly Ellyatt

Russian artillery shortages likely worsening, UK says

Russian artillery ammunition shortages have likely worsened in recent weeks to the extent that "extremely punitive shell-rationing is in force on many parts of the front," Britain's Ministry of Defense said in an intelligence update Tuesday.

"This has almost certainly been a key reason why no Russian formation has recently been able to generate operationally significant offensive action," it added.

The ministry noted that it was likely that Russia was already resorting to issuing old munitions stock which had previously been categorized as unfit for use.

The ministry noted that a presidential decree on March 3 laid down measures for Russia's Ministry of Trade and Industry to bypass the authority of the managers of defense industries who fail to meet their production goals.

"Russia is increasingly applying the principles of a command economy to its military industrial complex because it recognises that its defence manufacturing capacity is a key vulnerability in the increasingly attritional 'special military operation'," the U.K. noted.

— Holly Ellyatt

Fighting is tough and 'very painful' in the east, Zelenskyy says

Ukraine's President Volodymyr Zelenskyy insisted his forces could win the battle for Bakhmut in Donetsk, eastern Ukraine, as doubts continue over whether Ukraine should spend more manpower and resources on defending the besieged city.

"As always, today I was in touch with our commanders, with intelligence [officers]. It is very hard in the east - very painful," Zelenskyy said in his nightly address.

"We must destroy the enemy's military power - and we will destroy it," he said, adding that the defense of settlements big and small, such as Bilohorivka and Avdiivka or Bakhmut and Vuhledar, could determine what Ukraine's future looks like.

On Tuesday morning, Ukraine's military said in a Facebook post that Russian offensives continued around Bakhmut and surrounding towns "despite significant losses." It added that its forces had repelled more than 100 attacks in the Donetsk region but noted that Russian forces were relentless in their pursuit to capture Bakhmut.

There are doubts over the merits of defending Bakhmut, a city said to be almost completely surrounded by Russian forces and mercenary units.

Ukrainian military analyst Oleh Zhdanov said Ukraine was suffering losses among reserves it intended to use in planned counteroffensives against Russian forces, expected in late spring, and noted in an interview reported by Reuters that, "we could lose here everything we wanted to use for those counter-offensives."

— Holly Ellyatt

Moscow may extend Black Sea Grain deal but 'only for 60 days,' Russian official says

Russian Deputy Foreign Minister Sergey Vershinin said at a briefing in Geneva that Moscow may extend its participation in the Black Sea Grain deal but only for 60 days, according to Russian-state media RIA Novosti.

The Black Sea Grain Initiative, a deal brokered in July among Ukraine, Russia, Turkey and the United Nations, eased Russia's naval blockade and saw three key Ukrainian ports reopen. The deal is set to expire on March 18.

"Our further position will be determined depending on the real – not in words, but in deeds – progress towards the normalization of our agricultural exports, including bank payments, transport logistics, insurance, unfreezing of financial activities and the supply of ammonia through the Togliatti-Odessa pipeline," Vershinin said, according to an NBC News translation.

So far, more than 700 ships have sailed from Ukrainian ports.

— Amanda Macias

U.S. defense budget soars to $886 billion, the Pentagon's largest request

The Biden administration's proposed budget request for the fiscal year 2024 sets defense spending at $886 billion.

The defense budget includes about $1.7 billion to help Ukraine rebuild its critical infrastructure amid Russia's war. The budget will also finance multi-year contracts for missiles and other munitions to replenish U.S. stockpiles.

The federal budget also includes $63.1 billion for the State Department and USAID.

Secretary of State Antony Blinken said in a separate statement that the proposed funding "will make it possible for us to continue to promote U.S. national interests, lead the world in tackling global challenges, and continue support for the people of Ukraine."

— Amanda Macias

Spain trains Ukrainian military on Leopard 2A4 Tanks

The Spanish military shows Ukrainian soldiers how to use Leopard 2A4 tanks during a training exercise conducted at the San Gregorio military base outside Zaragoza, Spain.

The military aid for Ukraine has stoked tensions within Prime Minister Pedro Sanchez's governing coalition with its junior partner, the far-left Unidas Podemos party, urging the administration to focus on pushing for peace instead of sending weaponry. 

- Getty Images

Growing shortage of skilled workers at the Zaporizhzhia nuclear power plant, Ukraine says

Ukraine's military said that there is a shortage of skilled workers at the Zaporizhzhia nuclear power plant due to Russia's ongoing war.

"The shortage of skilled workers who can ensure the vital activity of the nuclear power plant is growing catastrophically," Ukraine's military said in an update posted on Facebook and translated by NBC News.

The nuclear power plant, Europe's largest, was captured by Russian forces in the early days of the full-scale invasion of Ukraine.

Ukraine's military also said that "the Russian occupiers employed people without the appropriate education and experience at the nuclear power plant."

"All this can lead to unpredictable consequences," the group added.

— Amanda Macias

Read CNBC's previous live coverage here:

Kyiv claims over 1,000 Russians died in Bakhmut in the last week; Ukraine’s first lady pleads for more weapons