Actually, the Europeans were far more responsible for this mess than Biden was.
Let's review, shall we?
The EU has been trying to pry Ukraine out of Russia's orbit for 20 years now, by enticing them with one-sided trade deals.
The proximate cause of this was when President Yanukovych rejected the EU's offer in 2013. Understandable. Yanukovych said he would need 15 billion over three years to make up for the loss of trade with Russia. The EU offered him a paltry 790 million.
That's when the US and EU started encouraging the Maidan revolution, which toppled Yanukovych (who did himself no favors by using excessive force to try to quell the revolt.)
The thing was, the Ethnic Russians in Ukraine were fine as long as they felt they had a voice in the government, but with Yanukovych gone, they decided to peace out. Thus the 8 year conflict between the Separatists and the government between 2014 and 2022.
Europe has now spent far more propping up the Comedian than it refused to spend 10 years ago when Yanukovych asked nicely.