U.S. President Joe Biden says that NATO will continue to help Ukraine in its opposition to Russian aggression.

He wrote about this on his Twitter page, accompanied by a photo of the leaders of the alliance member countries, who gathered for an extraordinary summit on Thursday.

"NATO leaders met today in Brussels – one month since the start of Russia's unprovoked and unjustified invasion of Ukraine. We will continue to support Ukraine with security assistance to fight Russian aggression and uphold their right of self-defense," the U.S. President said.