Biden meets with eastern NATO leaders, says Putin made 'big mistake' in suspending nuclear pact

President Joe Biden on Wednesday met with NATO allies closest to Russia and condemned Russian President Vladimir Putin for suspending his country's participation in the New START Treaty, the last remaining nuclear arms control agreement between the U.S. and the Kremlin.

"It's a big mistake," Biden said about Putin's decision on the treaty, USA Today reported. Biden made his brief comments to reporters as he entered the presidential palace in Warsaw, Poland, for a meeting with leaders from the Bucharest Nine Eastern Flank NATO Allies, which includes Bulgaria, the Czech Republic, Estonia, Hungary, Latvia, Lithuania, Poland, Romania and Slovakia.

The president concluded his four-day trip to Ukraine and Poland on Wednesday nearly one year after Russia's invasion of Ukraine. 

It is unclear what formal action, if any, Biden will take against Putin over Russia's suspension Tuesday of participation in the New START Treaty, which was signed in 2010.