Saying the world is witnessing “the beginning of an invasion — of a Russian invasion — of Ukraine,” President Joe Biden announced Tuesday he would begin to impose major new sanctions on Russia, threatening to add more if Russian President Vladimir Putin takes even more aggressive action.

“This is the beginning of a Russian invasion of Ukraine, as he indicated and asked permission to be able to do from his Duma,” referring to the Russian parliament, Biden said in remarks from the White House. “So, I’m going to begin to impose sanctions in response — far beyond the steps we and our allies and partners implemented in 2014,’ when Russian forces took over Crimea and tried to destabilize the Ukrainian government.