This has been CNBC's live blog covering updates on the war in Ukraine. [Follow the latest updates here.]
Moscow's suspension of U.S. inspections of its nuclear weapons facilities, part of a mutual inspection agreement under the 2010 New Start Treaty, represents a blow to arms control efforts, analysts say.
An Iranian satellite launched from a Russian-controlled base in Kazakhstan amid Western suspicion that it will be used to help Moscow's war aims, something that Tehran denies.
Russia has reportedly begun stripping some of its planes to get spare parts that it can no longer obtain from abroad due to sanctions.
Meanwhile, two more ships have left Ukraine carrying produce, as part of a deal brokered by Turkey to get crucial food supplies out from Russia's blockade of Ukrainian ports.
Celebrity chef and humanitarian Jose Andres shared a map showing the footprint of the World Central Kitchen, a humanitarian organization dedicated to feeding vulnerable communities, in Ukraine.
The Spanish chef and restaurateur brought the World Central Kitchen to Ukraine to address the food crisis triggered by Russia's war.
The two-star Michelin chef said that his organization has thus far served more than 130 million meals since Russia's war broke out more than five months ago.
— Amanda Macias
U.N. Secretary-General Antonio Guterres condemned the weekend shelling of the Europe's largest nuclear plant in Southeastern Ukraine, calling any attack on nuclear plants "a suicidal thing."
Rockets have reportedly hit the Zaporizhzhia nuclear power plant in recent days, and three radiation sensors were damaged, CNBC's Shepard Smith reported Tuesday. Ukrainian and Russian officials traded blame over the attacks.
Russia seized the plant five months ago in the early stages of the war after it invaded Ukraine.
The head of the United Nations watchdog called on both countries to let experts visit and assess the site. Guterres said on Tuesday that conditions there are "completely out of control."
—Lee Ying Shan
U.S. authorities are investigating investment advisory firm Concord Management, which oversaw hedge fund investments worth billions of dollars for Russian billionaire Roman Abramovich, the New York Times reported on Tuesday.
The investigation, being conducted by the Securities and Exchange Commission and the Federal Bureau of Investigation, is partly focused on how Abramovich's associates used several offshore shell companies to invest $8 billion in hedge funds and private equity firms, the report added, citing people close to the firm.
Abramovich is one of Russian President Vladimir Putin's allies and has been sanctioned by nations across the world over his support of Russia in its invasion of Ukraine.
-- Reuters
The State Department will provide $89 million to help clear land mines, improvised explosive devices and unexploded ordinances in Ukraine.
"Russia's forces have used explosive munitions in an irresponsible and brutal manner, causing civilian casualties extensive harm to vital civilian infrastructure and contaminating a massive amount of Ukraine's territory with unexploded ordnance and landlines," a State Department official told NBC News.
The official added that Ukrainian authorities have found Russian booby traps and improvised explosive devices hidden in cars, toys and in dead bodies.
The official told NBC News that an area of approximately 160,000 square kilometers may be contaminated by landmines and unexploded ordinance.
— Amanda Macias
The Ministry of Education and Science of Ukraine said that approximately 2,200 education facilities have been damaged across Ukraine since Russia's war began.
The ministry estimates that about 220 education facilities have been destroyed. The assessment comes as parts of Ukraine look to reopen the academic year next month.
"Due to ongoing hostilities, a back-to-learning campaign for the new academic year and university admissions may not be possible. In addition, if students continue to rely on online learning, additional equipment and services will likely be required," the U.N.'s Office for the Coordination of Humanitarian Affairs wrote in a statement.
— Amanda Macias
President Joe Biden signed ratification documents bringing Finland and Sweden one step closer to joining the NATO alliance.
"They will meet every NATO requirement, we are confident of that," Biden said before signing the documents.
Biden's signature follows a 95 to 1 Senate vote last week.
Following the U.S., the governments of the Czech Republic, Greece, Hungary, Portugal, Slovakia, Spain and Turkey still have yet to sign the instruments of ratification. All 30 NATO allies must approve Finland and Sweden's ascension to the alliance.
— Amanda Macias
Since the Kremlin invaded Ukraine on Feb. 24, the World Health Organization's Surveillance System for Attacks on Health Care estimates that there have been at least 434 attacks on vital health services in the country.
The organization reports that health care facilities were damaged 366 times, ambulances were targeted in 65 cases and at least 104 attacks affected crucial medical supplies. The group also estimated that attacks on health services led to at least 85 deaths and 101 injuries.
The Kremlin has previously denied that it targets civilian infrastructure like hospitals, schools and apartment buildings.
— Amanda Macias
U.S. President Joe Biden is set to sign the instruments of ratification for Finland and Sweden to join the NATO alliance at 2 p.m. ET.
Last week, the Senate voted 95 to 1 to ratify Finland and Sweden's entrance into the military group.
In May, both nations began the formal process of applying to NATO.
Biden welcomed leaders from both countries to the White House and pledged to work with the Senate — which has to sign off on U.S. approval of NATO bids — and the other 29 members of the world's most powerful military alliance to swiftly bring Sweden and Finland into the group.
— Amanda Macias
The Pentagon estimates that Russia's military has suffered between 70,000 and 80,000 casualties since the invasion of Ukraine began in late February.
The rare estimate shared by the Pentagon's third-highest official comes as the U.S. prepares its largest security assistance package for Ukraine. Casualties include soldiers who were killed or injured.
On Monday, the Biden administration announced a $1 billion weapons package, the 18th such installment, bringing U.S. commitment to about $9.8 billion since the start of the war.
— Amanda Macias
Chairman of the Joint Chiefs of Staff U.S. Army Gen. Mark Milley met with the Pentagon's top general overseeing Europe during a visit to Germany.
The two also met with French Chief of the Defense Staff Gen. Thierry Burkhard and "discussed items of mutual interest and shared assessments regarding the ongoing Russian invasion of Ukraine," according to a Pentagon readout of the meeting.
"The long-standing alliance between the U.S. and French militaries plays a critical role in maintaining peace and stability in Europe and other regions around the world," the readout added.
The meeting between Milley, U.S. European Command Gen. Christopher Cavoli and Burkhard comes as the U.S. readies its 18th weapons package for Ukraine.
— Amanda Macias
The British Embassy in Ukraine said that it has donated 100,800 Covid shots vaccines to the war-weary country.
"We're protecting those most in need by ensuring Ukrainians impacted by Russia's invasion are able to access essential healthcare and get vital vaccinations," the British Embassy wrote in a statement.
— Amanda Macias
The State Department is imposing visa restrictions on 100 people affiliated with the Alexander Lukashenka regime for their involvement in undermining the presidential election in Belarus in 2020.
Lukashenka, an ally of Russian President Vladimir Putin, has previously said that Belarus would support Russian forces amid the Kremlin's so-called special military operation in Ukraine.
"When it was clear the election had been stolen by the Lukashenka regime, the Belarusian people bravely took to the streets, with reports of hundreds of thousands of people amassing to peacefully demand free and fair elections and a democratic transition," Secretary of State Antony Blinken wrote in a statement.
— Amanda Macias
The United Nations Human Rights Office of the High Commissioner said that March was so far the deadliest month in Russia's war in Ukraine.
There were more than 3,100 civilian casualties and 2,400 injuries due to the conflict in March, according to data compiled by the UN.
In total, the United Nations has confirmed 5,401 civilian deaths and 7,466 injuries in Ukraine since Russia invaded on Feb. 24.
"Most of the civilian casualties recorded were caused by the use of explosive weapons with wide area effects, including shelling from heavy artillery, multiple launch rocket systems, missiles and air strikes," the UN office wrote in a report.
The human rights office added that the majority of casualties and injuries were reported in the Donetsk and Luhansk regions.
— Amanda Macias
Chairman of the Joint Chiefs of Staff Army Gen. Mark Milley met with his counterparts from Denmark, Finland, Iceland, Norway and Sweden at the Arctic Chiefs of Defense meeting on Monday.
"The military leaders discussed lessons learned from ongoing Arctic operations, cooperation between nations and the shared commitment to the international rules-based order," according to a Pentagon readout of the meeting.
"In coordination with allies and partners, the U.S. seeks to preserve the Arctic region as a space free of conflict, where nations act responsibly and where economic and energy resources are developed in a sustainable, transparent manner," the readout added.
A meeting of the Arctic Council was postponed earlier this year due to Russia's invasion of Ukraine. Russia was previously slated to chair the international forum until 2023.
Earlier this year the Arctic Council's seven other member countries - Canada, Finland, Denmark, the United States, Iceland, Norway and Sweden - agreed to boycott any meetings in Russia.
— Amanda Macias
Secretary of Defense Lloyd Austin slammed Russia's invasion of Ukraine and warned that "autocracy is on the march around the world."
"A military exists to serve its people and not the other way around. Militaries must play their legitimate role. That means defending human rights and protecting the rule of law, not toppling civilian governments or wallowing in corruption," Austin said during a change of command ceremony in Germany.
"That's especially important now when autocracy is on the march around the world," he said, adding that Moscow has shown its willingness "to sow chaos and threaten the rules-based international order."
— Amanda Macias
More than 10.5 million people have crossed Ukraine's border and left the country since Russia's invasion on Feb. 24, the United Nations High Commission for Refugees, UNHCR, said.
Most are now elsewhere in eastern and central Europe, with Poland, Russia, Romania, Moldova, Hungary and Slovakia taking in some of the largest numbers of refugees.
Moscow says it has taken in many Ukrainians and claims none of the arrivals were forced, though Ukrainian and Western officials as well as some activist groups say that hundreds of thousands of Ukrainians, including children, were forcibly deported and taken into Russia against their will.
— Natasha Turak
Ukrainian officials reported heavy shelling across frontline towns in the country's eastern Donbas region, particularly in Donetsk.
"The situation in the region is tense - shelling is constant throughout the front line ... The enemy is also using air strikes a great deal," Pavlo Kyrylenko, the regional governor of Donetsk, was quoted by The Guardian as saying on Ukrainian television. "The enemy is having no success. Donetsk region is holding."
Russian forces have taken a majority of the Donbas region, including essentially all of Luhansk and roughly half of Donetsk, according to analysts and officials. They have seen success in their assault toward the eastern town of Bakhmut, the U.K.'s Defense Ministry said Tuesday, but have made relatively slow territorial gains elsewhere in the Donbas in the last 30 days.
— Natasha Turak
Moscow announced the suspension of a setup that enabled Russian and American experts to inspect each other's nuclear weapons facilities, which had been agreed upon as part of the 2010 New START treaty.
The mutual inspections had initially been suspended over safety precautions due to the Covid-19 pandemic, but Russia now says that U.S. sanctions imposed after its invasion of Ukraine are the reason, as they prevented Russian inspectors from traveling to the U.S.
"There are no similar obstacles to the arrival of American inspectors in Russia," a statement from Russia's foreign ministry said. "The Russian Foreign Ministry raised this issue with the relevant countries, but did not receive an answer."
A U.S. State Department spokesperson said: "The United States is committed to implementation of the New Start Treaty, but we keep discussions between the parties concerning treaty implementation confidential."
Analysts say the decision to stop U.S. inspectors from traveling to Russia is a major blow to arms control efforts.
— Natasha Turak
Ukrainian President Volodymyr Zelenskyy is urging Western countries to ban entry for all Russians, as part of his call for broader sanctions on the country.
Zelenskyy called for the ban in an interview with The Washington Post, saying borders should be closed to Russians because they "are taking away someone else's land." He added that Russians should "live in their own world until they change their philosophy."
Large numbers of Russians have left their country since the invasion of Ukraine began; some to escape the effects of sanctions, and some out of opposition to the war and fear of Moscow's crackdown on dissent. Specific numbers of those who have fled Russia are not available, but estimates have placed the figure in the high hundreds of thousands, if not higher.
Several Western countries offer asylum for Russian dissidents including journalists and activists, and asylum applications have soared since the war began. While North American and much of European airspace has been closed to Russian aircraft, Russian citizens can still apply for visas to any of those countries.
Moscow dismissed Zelenskyy's demand as irrational, with the Kremlin saying that any attempts to isolate Russians will be futile and that Europe must decide whether it has to pay for Zelenskyy's "whims."
— Natasha Turak
Russia has started stripping jetliners of spare parts they can no longer obtain from overseas due to Western sanctions, Reuters reported, citing several anonymous sources.
The majority of Russia's jetliner fleet is made up of Western passenger planes, and one fairly new Airbus 350 as well as a Russian-made Sukhoi Superjet 100 are already being dismantled, Reuters wrote.
Sanctions imposed by Western countries after Russia invaded Ukraine in late February have cut many of Russia's business links to the countries it previously traded with, and have prevented its airlines from being able to get maintenance and spare parts in the West.
— Natasha Turak