I don't know if EU would be able to match the current support the US gives to Ukraine (maybe it already does? Or maybe it exceeds? I don't know either way) but what I'm sure off is that Europe won't stop trying even if it wouldn't be enough.
how sure are you? I think the economic struggles + losing US support would make every incumbent leader lose their jobs until UE is full of Trump supporters
If you add up all the aid from the US and compare it to aid from the EU plus European nations, I think the share of contributions is roughly equal. But if that’s right (and I did the math in my head while scrolling a huge spreadsheet on my phone), then the loss of support from the US is significant. The US ability to produce armaments is also unparalleled in the West, so a loss of that supply is also a huge issue. Then you have the loss of the US as a military backer which may free Putin to be more aggressive - dirty bombs, tactical nukes, blowing up a nuclear reactor, assassinating Ukrainian leadership, who knows what. It’s a huge problem for Ukraine if they lose the US. But will they? It’s hard to know for certain.