Russian President Vladimir Putin does not plan to stop only at Ukraine. If NATO did not react, war and chaos would threaten the whole of Europe.
Source: US President Joe Biden
According to Biden, despite the political risks and the blow to the American economy, the United States had to confront Russian aggression on Ukrainian territory.
“The option of doing nothing was worse. If he in fact moved into Ukraine, took hold of Ukraine, and Belarus, where it is, and he’s been a threat to NATO, all those things would have even been more dire.”
According to the US president, Russia’s military aggression could threaten chaos in Europe.
“Oh, I fear what would happen next is you’d see chaos in Europe. You would see the possibility they continue to move. You already saw what they’re doing in Belarus. What would happen in the surrounding countries. Watch what would happen in Poland, and, and the Czech Republic and all the members of NATO. For example, you know, the reason Putin said he was going to go in was because he didn’t want them to join NATO. And he wanted the sort of the Finland-ization of NATO. He got the NATO-ization of Finland, instead. No, I’m serious.”
See also: The United States has accused China of supporting Russia in the war against Ukraine