We'll see but one thing's for sure: Europe's armies could easily flatten Putin's forces and backed up by a nuclear deterrent too. The US has shouldered much of the financial burden of supporting Ukraine to date but at enormous huge cost. Its pragmatic proxy-warring has been disastrous for civilians.
I don't think a collection of European nations would decide to join the war. It would be more like a domino effect. They'd be pulled in one-by-one. UK residents mightn't support a war to save Ukraine but they would to save Germany. Like wise the Germans with Poland etc
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Biden’s approach has been weak, but going from that, to America being a Russian ally will be devastating for Ukraine.