This was CNBC's live blog tracking developments on the war in Ukraine. See below for the latest updates. 

Russian officials slammed the U.S.' decision to supply Ukraine with depleted uranium weapons, with one describing the move as a "criminal act."

The Pentagon announced $175 million in additional security assistance for Kyiv on Wednesday that included depleted uranium ammunition for U.S.-made Abrams tanks. Top Russian officials lambasted the move, with the Russian Embassy to the U.S. saying it was "an indicator of inhumanity."

Depleted uranium munitions are used by a number of countries, including the U.S. and U.K. — as well as Russia — as it's known for its high density and ability to penetrate heavy armored vehicles, making it highly effective against tanks.

Despite Russia's protestations, military experts agree that Russia possesses depleted uranium ammunition too although it's not known for sure whether they have used the weapons in Ukraine.

Senate leadership receiving classified briefing on Ukraine

Jake Sullivan, Biden's top national security advisor, will give a classified briefing to Senate leadership as well as senators on relevant committees on the war in Ukraine, NBC News reports.

Senate Majority Leader Chuck Schumer (D-NY) confirmed the classified briefing during remarks on the Senate floor.

"I expect we'll see precisely why now more than ever our friends abroad need our help. We must continue to show [Russian President Vladimir] Putin and the forces of autocracy that the U.S. stands firmly behind Ukraine," Schumer said.

"What is the point in cutting off support now when we're at a turning point in the war? Inflection point. When we have — after we've invested such a large money of resources to get us to this inflection point is a crucial moment right now," he added.

Schumer also called on the House to work in a bipartisan way to avoid a looming government shutdown.

— Amanda Macias

Blinken tours Kyiv after announcing over $1billion of new assistance to Ukraine

U.S. Secretary of State Antony Blinken spent his second day to Ukraine visiting sites in the country. It's his fourth trip to Ukraine since Russia invaded its neighbor in February 2022.

A day earlier, America's top diplomat announced a package worth more than $1 billion for Ukraine's fight.

— Amanda Macias and Brendan Smialowski | AFP | Getty Images

Ukrainian counteroffensive making 'tangible progress', Blinken tells NBC News

Ukrainian military forces are making "very tangible progress" in the counteroffensive against Russian forces, American Secretary of State Antony Blinken told NBC News Thursday.

"I think we are seeing real forward movement," Blinken said, "but again, this is going to go on. This is tough, this is hard."

Blinken made the comments on the second day of his surprise visit to Ukraine, after announcing a $1 billion aid package for the country Wednesday.

— Hannah Ward-Glenton

British American Tobacco to end Russia business within the next month

British American Tobacco said in a press release it plans to have sold its Russian and Belarusian businesses "within the next month."

BAT had announced in March 2022 that the ownership of its businesses in Russia were "no longer sustainable in the current environment," and said it would be transferring its business.

The tobacco giant will "no longer have a presence in Russia or Belarus" or make any financial gains from ongoing sales in those markets.

BAT said it was confident it would deliver according to its full-year guidance.

The news comes after droves of companies announced they would leave Russia following the full-scale invasion of Ukraine, but many still have a presence in the country.

— Hannah Ward-Glenton

Around 90% of Ukrainian war prisoners have endured torture, rape or other abuse: Prosecutor

Around 90% of Ukrainian prisoners of war have endured torture, rape or other abuse, Ukrainian Prosecutor General Andrii Kostin wrote on X, formerly known as Twitter.

"Russia established an elaborate system of torture and ill-treatment of the detained Ukrainians, both prisoners of war and civilians," Kostin wrote, saying he had discussed how to "fortify" the global effort against the "heinous and unlawful practices" with the United Nations Special Rapporteur on Torture, Alice Edwards.

"In Kherson region alone, 11 torture chambers have been established. In Kharkiv region, investigations pertain to nearly 100 instances involving over 700 identified victims. We see similar patterns in other de-occupied regions," Kostin said.

"Thus far, 156 suspects—members of Russia's armed forces and occupying "authorities"—have been identified, with 114 indicted and 35 convicted for torture and ill-treatment as war crimes," he added.

Kostin went on to tell the story of a 32-year-old coffee shop owner from Kherson, who was arrested by Russian forces after an American-made cash register was used as evidence of him being under U.S. influence.

"For 17 days, he was subjected to repeated torture. Occupiers also tormented him with threats to rape his wife and send his infant child to the orphanage," Kostin said.

"They released the detainee only after his family paid UAH 100,000 [$2,708.69]. Before the release, he was forced to record a video saying that he had donated the money 'for the special military operation'."

CNBC was unable to independently verify the information in this post, and the Russian foreign ministry did not immediately respond to CNBC's request for comment.

— Hannah Ward-Glenton

Russia's security service reportedly detains alleged Ukrainian smugglers

Russia's state security service (the FSB) has detained a group of people that it alleged were involved in trading military aircraft parts, including those used in Ukraine's aircraft and helicopters, Russian news agency TASS reported Thursday.

"The activities of an organized group specializing in the illegal trafficking of military products, as well as in the smuggling of components and spare parts for military aircraft to Western European countries have been suppressed," the FSB's press office told TASS.

The FSB reportedly told the news agency that those detained were Ukrainian and one individual was from a Central Asian country.

The security service alleged that the group "carried out on an ongoing basis the acquisition in the Russian Federation and repair of components and assemblies of combat aircraft and helicopters for the purpose of their subsequent illegal export in the interests of foreign customers, including for the needs of the Armed Forces forces of Ukraine." 

It said it had seized items for military aircraft and documentation "on the participation of the detainees in organizing repair and restoration work in relation to components for Ukrainian military aircraft and helicopters." It did not present its evidence publicly.

— Holly Ellyatt

NATO has no indication of intentional Russian attack on Romania

NATO does not have any indication that drone debris found on Romanian territory was caused by a deliberate Russian attack on Romania, its chief said on Thursday.

Ukraine had said on Monday that drones detonated in Romania during an overnight Russian air strike on a Ukrainian port across the Danube River.

Attacks have increased on the site since July when Moscow abandoned a deal that lifted a de facto Russian blockade of Ukraine's Black Sea ports.

Romanian officials initially denied the Ukrainian allegations but changed course on Wednesday, with Defence Minister Angel Tilvar saying that parts of what could be a Russian drone fell on Romanian soil.

"We don't have any information indicating an intentional attack by Russia, and we are awaiting the outcome of the ongoing investigation," NATO Secretary-General Jens Stoltenberg told EU lawmakers.

Stoltenberg stressed the risks Russian air strikes in such close vicinity to the alliance's territory posed. "It demonstrates the risks of incidents and accidents," he said. "Regardless of that outcome (of the investigation), what we have seen of course is a lot of fighting and also air attacks close to NATO borders."

Russia has carried out long-range air strikes on targets in Ukraine since it invaded its neighbour last year, and Kyiv has reported suspected Russian weapons flying over or crashing into neighbouring countries several times.

In the most serious incident, two people were killed in Poland by a missile that fell near the frontier last November. Poland and NATO allies later said it was a misfired Ukrainian air defence missile.

— Reuters

Ukraine gaining ground in counteroffensive, NATO's Stoltenberg says

Ukraine is making progress with a counteroffensive it started in June to reclaim territory seized by Russia, NATO Secretary-General Jens Stoltenberg told European lawmakers Thursday.

"The Ukrainians are gradually gaining ground ... this is difficult fighting but they have been able to breach the defensive lines of the Russian forces, and they are moving forward," Stoltenberg told a session of the European Parliament. "We need to continue to support Ukraine," he added.

Stoltenberg's comments come after several months of intense fighting in Ukraine's southern and eastern regions, along which there is a 900-kilometer (559-mile) front line. Russian forces occupying the south and east of the country are deeply dug in behind layers of defensive lines, making advances difficult.

There are concerns that war fatigue could be setting in among some quarters of Ukraine's allies, with some Republican lawmakers voicing reticence over continued, massive amounts of funding for Kyiv.

— Holly Ellyatt

Drones target Russian cities, again

Russia shot down several drones over the city of Rostov-on-Don in southwest Russia, and near the border with Ukraine, introducing a state of emergency at the site as residents were evacuated and damage assessed.

Moscow and Bryansk were also targeted in separate attacks.

The governor of the Rostov region, Vasily Golubev, said on Telegram Thursday that air defense systems had been activated in the early hours and that "two drones were shot down." 

“One fell outside the city, in the western part of Rostov, the second — in the center, near Pushkinskaya Street. As a result, several cars were damaged. One person was injured,” Golubev said, adding later that three buildings were also damaged. 

“Updated information about the consequences in the center of Rostov: the facades of three buildings were damaged and windows were broken, several cars were damaged. Only one person sought medical help, with cut wounds to his legs, he refused hospitalization,” the officials said.

Ukraine has not commented on the incident although there has been a notable increase recently in drone attacks against Russian territory. Rostov-on-Don gained notoriety as Wagner Group mercenary fighters "occupied" the city during their apparent rebellion against the Russian state.

Moscow's Mayor Sergey Sobyanin said on his Telegram account Thursday that air defense forces had stopped an attempted drone attack on the Ramensky district of Moscow. There were no reports of damage or casualties, he said.

Meanwhile, the Governor of Bryansk Alexander Bogomaz reported three separate drone attacks over the region and near the city of Bryansk, one assault caused minor damage to a railway station, station square and several cars.

— Holly Ellyatt

Russia slams U.S. move to supply depleted uranium weapons to Kyiv

Russian officials slammed the U.S.' decision to supply Ukraine with depleted uranium weapons, with one describing the move as a "criminal act."

The Pentagon announced $175 million in additional security assistance for Kyiv on Wednesday that included depleted uranium ammunition for U.S.-made Abrams tanks that are soon to be delivered to Ukraine.

Depleted uranium munitions are used by a number of countries, including the U.S. and U.K. — as well as Russia — as it's known for its high density and ability to penetrate heavy armored vehicles, making it highly effective against tanks. Military experts agree that Russia possesses and uses depleted uranium ammunition.

Its use is not without controversy with critics saying it could be linked to serious health problems among anyone exposed to the material.

"This is not just an escalatory step, but it is a reflection of Washington's outrageous disregard for the environmental consequences of using this kind of ammunition in a combat zone. This is, in fact, a criminal act, I cannot give any other assessment," Sergei Ryabkov said, according to Russia's TASS news agency.

Ryabkov also said the West was increasing its pressure on Moscow and that carried risks, stating:

"Now this pressure is dangerously balancing on the brink of direct armed conflict between nuclear powers," he said.

The Russian embassy to the U.S. also slammed Washington's decision to supply depleted uranium rounds to Ukraine, saying it was a "clear sign of inhumanity."

It said Washington is "obsessed with the idea of inflicting a 'strategic defeat' on Russia, is ready to fight not only to the last Ukrainian but to put a cross on the future generations," the embassy wrote on its Telegram channel.

— Holly Ellyatt

Former Vice President Mike Pence calls Putin a 'war criminal'

Former Vice President Mike Pence called Russian President Vladimir Putin a "war criminal" when asked by reporters following a town hall in Henniker, New Hampshire.

"The reality is that the Russian military is engaged in thousands of war crimes against citizens and Vladimir Putin's decision to send his brutal military across the border is just the latest instance of his effort to attempt to redraw international lines by force," Pence said.

The Republican presidential hopeful also slammed American entrepreneur Vivek Ramaswamy who dodged the same question about Putin during a campaign earlier in the week.

"I don't understand what facts Vivek is waiting to learn about Vladimir Putin or about Russia's brutal and unprovoked invasion in Ukraine," Pence added.

Pence was the first Republican presidential candidate to travel to Ukraine after Russia invaded.

The June trip was only 12 hours, but included a meeting with Ukrainian President Volodymyr Zelenskyy and a visit to pay respects at mass grave sites discovered after Russian soldiers retreated from Ukrainian cities.

— Amanda Macias

U.S. announces $1 billion assistance package for Ukraine

U.S. Secretary of State Antony Blinken made a surprise visit to Kyiv as the U.S. announced a new assistance package for Ukraine worth $1 billion.

The latest package includes $175 million for weapons, $206 million in humanitarian assistance and $203 million to be used for transparency anti-corruption efforts. To date, the Biden administration has provided more than $43.2 billion since the start of Russia's full-scale invasion of Ukraine.

Blinken's trip, his fourth to the war-weary country since the start of the war, comes as some Republican presidential candidates voice concerns over the massive outpouring of U.S. aid to Ukraine.

Read the full story here.

— Amanda Macias

White House says North Korea has not yet provided weapons directly to Russia for the fight in Ukraine

National Security Council spokesman John Kirby reiterated warnings that North Korea should not supply Russia with weapons for the Kremlin's war in Ukraine.

"We have seen them provide rockets and artillery to the Wagner Group but that was months ago," Kirby told reporters at the State Department, adding that the U.S. has not seen Pyongyang provide weapons directly to Moscow.

"We will see how it goes," Kirby said, adding that the U.S. does not have formal diplomatic relations with North Korea and therefore will continue to issue warnings publicly.

— Amanda Macias

Photos show aftermath of attack in Ukraine's Kostyantynivka

Photos show the aftermath of an attack on the small town of Kostyantynivka in the Donetsk region of Ukraine.  

So far 16 civilians have been reported dead, while at least 20 were injured, Interior Minister Ihor Klymenko posted on Telegram, as translated by NBC News.

Ukrainian President Volodymyr Zelenskyy said the attack hit a market, shop and pharmacy on his official Telegram channel, as translated by NBC's Artem Grudinin.

"The audacity of evil. The brazenness of wickedness. Utter inhumanity," Zelenskyy wrote.

— Hannah Ward-Glenton

At least 16 dead and 28 injured in Donetsk region, Ukraine says

At least 16 people have been killed and a further 28 injured in the Donetsk region of Ukraine, Interior Minister Ihor Klymenko posted on Telegram, as translated by NBC News.

"Police paramedics and doctors provide medical assistance to the injured. Emergency personnel quickly extinguished the fire with an area of ​​300 square meters. About 30 trade pavilions were damaged," Klymenko wrote in the post.

Ukrainian President Volodymr Zelenskyy wrote on X, formerly known as Twitter, that the attack struck innocent people, hitting a market, shops and a pharmacy.

"Heinous evil. Brazen wickedness. Utter inhumanity," he wrote.

The small town of Kostyantynivka is next to a battlefield and has already come under Russian fire multiple times since the outbreak of the war.

— Hannah Ward-Glenton

Russia seeks 'revenge' after Ukraine regains territory in the east, commander says

Russian forces are looking to take "revenge" for territory that Ukraine has regained in the east and hope to recapture the operational initiative on the front, the commander of Ukraine's ground military said on Wednesday.

Colonel General Oleksandr Syrskyi said in a briefing that the operational situation in eastern Ukraine remained "challenging," with Russian forces pushing ahead with "their plans to reach the borders of the Donetsk and Luhansk regions" in the east.

"They are stubbornly preparing to take revenge and recapture the operational initiative," Syrskyi said, in comments published by Ukrainian news agency Ukrinform.

Ukraine's deputy defense minister Hanna Maliar said on Telegram on Monday that 47 square kilometers (18 miles) of Russian-occupied land has been liberated in the Bakhmut area of Donetsk, eastern Ukraine. During the past week, she said, three square kilometers of territory had been freed in the area.

Fighting remains intense in Donetsk, with Syrskyi stating that "fierce battles are underway" in the Bakhmut region, and that "Russian invaders are making attempts to hold the captured positions, but Ukrainian warriors are gradually pushing them away."

Syrskyi said his priority is to prevent captured frontiers and positions in the Kupiansk and Lyman areas from being lost, and to successfully advance in the Bakhmut sector.

CNBC was unable to independently verify developments on the ground.

— Holly Ellyatt

U.S. Secretary of State Blinken makes unexpected trip to Kyiv

U.S. Secretary of State Antony Blinken arrived in Kyiv on Wednesday for meetings with key Ukrainian officials, including President Volodymyr Zelenskyy and Foreign Minister Dmytro Kuleba. 

Blinken's trip to the Ukrainian capital had not been disclosed ahead of his arrival and comes as Ukraine prosecutes its counteroffensive in the south and east of the country.

The U.S.' top diplomat is expected to announce more than $1 billion in new funding for Ukraine, a senior State Department official said during a briefing for reporters on the trip.

He will also participate in laying a wreath with Foreign Minister Kuleba in memory of soldiers who have died during the 19 month-long conflict.

The trip comes after Kyiv was targeted by Russian missiles overnight, which were intercepted, the city's military administration said earlier. 

 — Holly Ellyatt

Kyiv and other parts of Ukraine hit by massive drone, missile strikes

Ukraine was attacked with a barrage of drones and missiles overnight, officials said, with the capital Kyiv and the southern port of Odesa among the targets.

On Wednesday, Ukraine's air force said on Telegram that its air defenses destroyed 23 out of 33 air and ground-launched missiles and attack drones that were used against the country, according to a Google translation.

"A total of 33 enemy air targets were recorded: seven air-based Kh-101/Kh-555/Kh-55 missiles launched from nine Tu-95ms strategic bombers from the Engels area, one Iskander-M ballistic missile, 25 Shahed-136/131 attack UAVs [unmanned aerial vehicles] launched from the south-eastern and southern directions."

Serhiy Popko, the head of the Kyiv city military administration, said the capital Kyiv was attacked by cruise missiles and, potentially, by ballistic missiles.

"The attack is not simple, but combined," Popko said on Telegram, according to a Google translation. "Preliminary, from the Saratov region, the Russian Tu-95MS strategic aviation aircraft fired cruise missiles of the Kh-101/555/55 type. At the same time, missiles of a different type, probably ballistic, were launched over Kyiv."

He said the missiles had been destroyed, and no injuries or damage to infrastructure were recorded as yet.

Oleg Kiper, the head of the Odesa Regional Military Administration said that the southern port was attacked by Russian drones for almost three hours. One person was wounded and died during the attacks, he said on Telegram.

"Destruction and fires were recorded in several settlements. Portside and agricultural infrastructure facilities were damaged: elevators, administrative buildings, agricultural enterprises," Kiper said in Google-translated comments. Air alerts continued in the city this morning.

CNBC was unable to immediately verify the information in the posts.

— Holly Ellyatt