Russia-Ukraine updates: US sanctions Russian military shipbuilder, diamond miner

President Joe Biden said Thursday that G-7 leaders discussed the impact the war in Ukraine has had on food supply in European countries and the U.S., noting that both Ukraine and Russia “have been the breadbasket” of Europe and some of the largest producers of wheat.

“The price of these sanctions is not just imposed upon Russia, it’s imposed upon an awful lot of countries as well, including European countries and our country as well,” he said.

The president said he urged European leaders to end trade limitations on sending food abroad in order to alleviate the food shortage, highlighting that the U.S. and Canada are also large producers of wheat.

“We are in the process of working out with our European friends what it would be -- what it would take to help alleviate the concerns relative to food shortages. We also talked about a significant major U.S. investment among others, in terms of providing for the need for humanitarian assistance, including food, as we move forward,” Biden said.

-ABC News' Armando Garcia

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."