Russia's largest military shipbuilding and diamond mining firms were targeted.
Russian President Vladimir Putin's "special military operation” into Ukraine began on Feb. 24, with troops crossing the border from Belarus and Russia. Moscow's forces have since been met with “stiff resistance” from Ukrainians, according to U.S. officials.
Russian forces retreated last week from the Kyiv suburbs, leaving behind a trail of destruction. After graphic images emerged of civilians lying dead in the streets of Bucha, U.S. and European officials accused Russian troops of committing war crimes.
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A look at the two leaders at the center of the war in Ukraine and how they both rose to power, the difference in their leadership and what led to this moment in history.
Defense Secretary Lloyd Austin told the Ukrainian minister of defense, Oleksii Reznikov, on Thursday that security assistance from the U.S. is now flowing into the region.
This includes aid from the $1 billion in security assistance recently announced by President Joe Biden, according to Pentagon press secretary John Kirby.
-ABC News' Matthew Seyler
British Prime Minister Boris Johnson on Thursday said consequences would be "very, very severe" if Vladimir Putin deploys chemical weapons.
"I think it would be catastrophic for him if he were to do that. And I think that he understands that," Johnson said.
He added that he thinks Biden was right in saying Putin's comments are a "clear sign" Russia is weighing the use of chemical weapons.
"I think [President] Joe Biden is right to warn ... because you know, when the Russians start doing this stuff about, 'oh, well … the factories in Ukraine producing American biological weaponry,' you know that is a prelude to a false flag operation and they could well do something, but I think it will make a profound and a disastrous mistake for Putin."
-ABC News' Christine Theodorou
President Joe Biden spoke to reporters Thursday, hours after a NATO emergency summit, saying that Russia's President Vladimir Putin "was banking on NATO being split," but NATO has never been more united than it is today.
"My early conversation with him in December and early January, it was clear to me he didn't think we could sustain this cohesion. NATO has never, never been more united than it is today. Putin is getting exactly the opposite of what he intended to have as a consequence of going into Ukraine," Biden said.
Biden has warned Russia may use chemical weapons in Ukraine and said that the U.S. and NATO would respond if they are used. Biden said the response would depend on the nature of the use of the weapons.
When asked whether this means they could cross the border into Ukraine, Biden said this is a decision they would make at the time.
The president said that he believes Russia should be removed from the G-20, but he raised the possibility that if removing Russia can’t be done because of "Indonesia and others" not in agreement, Ukraine should be able to attend future G-20 meetings.
Biden also spoke about the 100,000 Ukrainian refugees the U.S. will accept, with the caveat that they will be accepted "with a focus on reuniting families."
The United Nations General Assembly on Thursday voted to pass a resolution titled "Humanitarian consequences of the aggression against Ukraine," which explicitly names Russia as an aggressor party.
The resolution demands that Russia withdraw its military forces outside the internationally recognized borders of Ukraine.
It also condemns violations of humanitarian law and human rights abuses and seeks protections for civilians.
The resolution passed with 140 countries voting in favor, five voting against and 38 abstaining. The countries voting against the resolution were: Russia, Belarus, Syria, Eritrea and North Korea.
-ABC News' Zoha Qamar
