This has been CNBC's live blog tracking developments on the war in Ukraine. Follow the latest updates here.
Russia continues its offensive in Ukraine's south and east, while Ukrainian counter-measures far behind enemy lines gain traction. Most notable is its suspected attack on Russian warplanes earlier this week at an airbase in Crimea.
Satellite images reveal at least eight Russian planes damaged or destroyed by explosions that hit the base on Tuesday, contrary to Moscow's denials that any aircraft was harmed.
Concerns continue to mount over the safety of the Zaporizhzhia nuclear power plant in southern Ukraine. Meanwhile, Britain's Ministry of Defense says Russia's arms export industry is under strain.
National security advisor Jake Sullivan and Chairman of the Joint Chiefs of Staff Gen. Mark Milley spoke with their Ukrainian counterparts, according to a Pentagon readout of the call.
"They discussed the unprovoked and ongoing Russian aggression in Ukraine and international support for the Ukrainian armed forces. Sullivan and Milley reaffirmed the steadfast support of the United States for Ukraine's sovereignty and territorial integrity," the readout said of the call with Andriy Yermak of Zelenskyy's office and Commander-in-Chief of the Ukrainian Armed Forces Gen. Valery Zaluzhny.
The leaders also discussed additional arms packages.
— Amanda Macias
U.N. Secretary-General Antonio Guterres called for all military activity around Zaporizhzhia nuclear power complex to end.
"Regrettably, instead of de-escalation, over the past several days there have been reports of further deeply worrying incidents that could, if they continue, lead to disaster," Guterres said in a statement.
"We must be clear that any potential damage to Zaporizhzhia or any other nuclear facilities in Ukraine, or anywhere else, could lead to catastrophic consequences not only for the immediate vicinity, but for the region and beyond. This is wholly unacceptable," he added.
Guterres also urged Moscow and Kyiv to agree on a path that would grant the IAEA, a nuclear watchdog agency, access to the site.
— Amanda Macias
A court in Russia ordered a former state TV journalist placed under house arrest for nearly two months pending an investigation and potential trial on charges of spreading false information about Russia's armed forces.
Marina Ovsyannikova was charged over a street protest last month, when she held up a banner that said, "Putin is a killer, his soldiers are fascists. 352 children have been killed (in Ukraine). How many more children should die for you to stop?"
If convicted, Ovsyannikova faces up to 10 years in prison under a new law that penalizes statements against the military. The law was enacted shortly after Russian troops moved into Ukraine.
In the courtroom on Thursday, Ovsyannikova held up a poster saying "Let the murdered children come to you in your dreams at night." She first made international headlines on March 14, when she staged an on-air protest against Moscow's war in Ukraine.
In March, Ovsyannikova appeared behind the anchor of an evening Channel One news broadcast holding a poster that said "Stop the war, don't believe the propaganda, they are lying to you here." She quit her job at the channel, was charged with disparaging the Russian military and fined 30,000 rubles ($270 at the time).
— Associated Press
Ukrainian President Volodymyr Zelenskyy called the Russian shelling near Zaporizhzhia nuclear power plant "one of the biggest crimes of the terrorist state."
"Russian shells were recorded on the territory of the station in the immediate vicinity of the nuclear power plant facilities. Russia once again hit the bottom in the world history of terrorism. No one else has so obviously used a nuclear plant to threaten the whole world and to put forward some conditions," Zelenskyy said in an evening address on the Telegram messaging app.
Zelenskyy said that the fate of Zaporizhzhia is a global interest and called for Russia's immediate departure from the site and from Ukraine.
— Amanda Macias
U.S. Ambassador to Ukraine Bridget Brink called Russian shelling around the Zaporizhzhia nuclear power plant "the height of irresponsibility."
In a tweet, Brink said that she shared that sentiment during a meeting with Ukrainian Prime Minister Denys Shmyhal.
In recent days, Zaporizhzhia, Europe's largest nuclear power plant has been beset with Russian strikes.
— Amanda Macias
The Finnish government says it has registered a record number of asylum seekers following Russia's invasion of Ukraine.
The Nordic country said that it has so far processed 33,480 applications for protection or about 95% of the applicants.
"One-third of those fleeing Ukraine are children," Finland's Immigration Service said in a statement, adding that the government is also preparing to enroll these children in Finnish schools.
— Amanda Macias
Nearly 4 million Ukrainians have registered as refugees seeking temporary protection status in European countries, the United Nations Refugee Agency estimates.
More than 10.6 million people have fled Ukraine's borders since Russia invaded Ukraine in late February, according to U.N. estimates. The majority of refugees have relocated to Poland, according to data collected by the agency.
"The escalation of conflict in Ukraine has caused civilian casualties and destruction of civilian infrastructure, forcing people to flee their homes seeking safety, protection and assistance. In the first five weeks, more than four million refugees from Ukraine crossed borders into neighbouring countries and many more have been forced to move inside the country," the agency wrote.
— Amanda Macias
Editor's note: Graphic Content. Post shows images of body bags ahead of burial at a cemetery in Bucha, Ukraine.
The United Nations has confirmed 5,401 civilian deaths and 7,466 injuries in Ukraine since Russia's Feb. 24 invasion.
The Office of the U.N. High Commissioner for Human Rights said the death toll in Ukraine is likely higher, because the armed conflict can delay fatality reports.
The international organization said most of the civilian casualties recorded were caused by the use of explosive weapons with a wide impact area.
— Sergey Supinski | AFP | Getty Images
Celebrity chef Jose Andres met with Ukrainian President Volodymyr Zelenskyy in Kyiv after delivering more than 130 million meals to the war-torn country since Russia's invasion.
The two-star Michelin chef and restaurateur brought the World Central Kitchen, a humanitarian organization dedicated to feeding vulnerable communities, to Ukraine to address the food crisis triggered by Russia's war.
— Amanda Macias
Ukrainian nuclear company Energoatom says the situation at Zaporizhzhia nuclear power plant is getting worse and that Russian shelling continues at the site.
"The invaders once again targeted the territory of the nuclear power plant, the hit was recorded not far from the first power unit. They damaged the sewage pumping station. Extensive smoke was seen nearby," Energoatom wrote on the Telegram messaging app.
"The situation is getting worse," the company wrote, adding that "several radiation sensors have been damaged."
— Amanda Macias
British Defence Secretary Ben Wallace approved the delivery of additional multiple-launch rocket systems and missiles to Ukraine.
"This latest tranche of military support will enable the Armed Forces of Ukraine to continue to defend against Russian aggression and the indiscriminate use of long-range artillery," Wallace wrote in a statement.
"Our continued support sends a very clear message, Britain and the international community remain opposed to this illegal war and will stand shoulder-to-shoulder, providing defensive military aid to Ukraine to help them defend against Putin's invasion," he added.
Ukrainian troops were trained by British forces on how to use these weapons systems earlier this year.
— Amanda Macias
Satellite images show the aftermath of a Ukrainian missile strike on a Russian air base in Crimea. The images reveal at least eight Russian planes damaged or destroyed.
The Kremlin denies any aircraft were lost, but does say 1 person was killed and 14 were injured.
— DeLon Thornton
Ukrainian Foreign Minister Dmytro Kuleba slammed Russians for cheering "missile strikes on Ukrainian cities" and for their overall support of the Kremlin's war.
"This is Russia's, not just Putin's war. Not Putin, but actual Russian soldiers come from Russia to kill, torture and destroy. Russians overwhelmingly support the war, cheer missile strikes on Ukrainian cities and murder of Ukrainians," Kuleba wrote on Twitter.
"Let Russian tourists enjoy Russia then," he added.
A day prior, Kuleba called on the European Union and the G-7 countries to stop issuing visas to Russian citizens.
— Amanda Macias
McDonald's is planning a phased reopening of some of its restaurants in Ukraine, where the company noted other businesses are safely operating.
The fast-food company said in a message posted to its website that it will work over the next few months to get product back to the restaurants, bring back employees and physically prepare its locations in Kyiv and western Ukraine to start serving customers again.
McDonald's had announced in February that it would pause its operations in Ukraine after Russia's invasion of the country. Before that, McDonald's had 109 restaurants in Ukraine. The chain declined to comment on how many restaurants will be opening as part of its plan to resume operations in the country.
"We've spoken extensively to our employees who have expressed a strong desire to return to work and see our restaurants in Ukraine reopen, where it is safe and responsible to do so," Paul Pomroy, the corporate senior vice president of international operated markets, said in the message posted online. "In recent months, the belief that this would support a small but important sense of normalcy has grown stronger."
— Ian Krietzberg
The Director General of the International Atomic Energy Agency, Rafael Mariano Grossi, will brief the United Nations security council about the nuclear safety and security situation at Ukraine's Zaporizhzhia nuclear power plant.
Grossi will also share plans with the international forum on efforts to lead an IAEA expert mission to the site as soon as possible.
Grossi is scheduled to address the U.N.'s security council at 3 p.m. ET.
His remarks come on the heels of Russian shelling at the nuclear power plant that has triggered widespread alarm about the potential risk of a severe nuclear accident.
— Amanda Macias
Ukrainian President Volodymyr Zelenskyy urged Western allies to send Ukraine weapons and ammunition "to the maximum extent possible" during a virtual address before northern European allies gathered in Denmark.
Zelenskyy also requested governments to impose additional sanctions on Russia.
"It is the duty of our countries and all future generations of free people to do everything we can to stop Russia, to ensure that it loses this war, and to ensure that no other nation can repeat this terror," he added.
— Amanda Macias
UN human rights experts are raising concerns regarding children with disabilities in Ukraine caught in the crosshairs of the Kremlin's war.
"The current humanitarian crisis stemming from the Russian invasion last February has placed Ukraine in an existential crisis. Like all conflicts, it is having a disproportionate impact on persons with disabilities especially children with disabilities placed in institutions," UN experts wrote in a statement.
The experts said that in some cases children receiving care in specialized institutions have been displaced and in some cases completely separated from their families due to Russian attacks on educational and medical facilities.
"We strongly reiterate our many previous calls on the Russian Federation to immediately end its aggression against Ukraine," the experts said, and called on Ukraine to invest in this specific cause during reconstruction, pledging their assistance in that effort.
— Amanda Macias
Satellite imagery from U.S.-based Planet Labs shows at least eight Russian warplanes damaged or destroyed from massive explosions that took place on Tuesday at Russia's Saky airbase in Crimea.
The Kremlin has denied that any planes were damaged in the blasts that it says killed one person, injured 14 more and damaged nearby houses.
The Ukrainian air force says at least nine Russian planes were destroyed while on land, although Ukrainian officials have not publicly taken responsibility for what analysts say was likely an attack either directed by Kyiv or carried out by Ukrainian partisans.
Russia has downplayed the possibility of a targeted attack, although analysts say the satellite imagery suggests just that. Moscow has said that "aviation munitions detonated" in a storage facility at the base.
— Natasha Turak
Britain and Denmark will provide more military and financial aid to Ukraine in its defense against Russia's invasion, the countries' defense ministers said during a Ukraine Donor Conference in Copenhagen.
Denmark will up its financial aid to Ukraine by 110 million euros ($114 million), bringing its total financial aid for the embattled country since the war began to more than 3 billion Danish crowns, or $417 million.
"This is a war on the values that Europe and the free world are built upon... Today we reaffirm our commitment to support of Ukraine," Danish Prime Minister Mette Frederiksen said at the conference.
The U.K. has already supplied Ukraine with advanced weapons and training for its armed forces, and is the second-largest provider of military aid for the country after the U.S. Britain will donate more multiple-launch rocket systems to Ukraine as well as a "significant number" of precision-guided missiles capable of hitting targets up to 50 miles away, U.K. Defense Secretary Ben Wallace said.
"This latest tranche of military support will enable the armed forces of Ukraine to continue to defend against Russian aggression and the indiscriminate use of long-range artillery," Wallace said in a statement.
"Our continued support sends a very clear message, Britain and the international community remain opposed to this illegal war and will stand shoulder-to-shoulder, providing defensive military aid to Ukraine to help them defend against Putin's invasion," he said.
— Natasha Turak
The number of Russian airstrikes on civilian and military infrastructure has doubled from the prior week, Oleksiy Hromov, Ukrainian brigadier general, said during a news conference. He added, however, that the accuracy of the strikes is low.
"The enemy's planes and helicopters avoid flying into the range of our air defenses, and therefore the accuracy of these strikes is low," he was quoted by Reuters as saying.
CNBC was not able to independently verify the information.
— Natasha Turak