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.

Europe is great at producing armaments as well - but there are a lot of useful armaments that are only produced in the US. If you had to choose either EU or US support, the US is the better option as they can give you things that the EU cannot even though the EU has more people than the US and a good economy.

The Patriot system is one the of best examples. EU doesn't really have anything in this space, but Ukraine needs more of it yesterday.

Thanks a lot for doing that, even thought kind of ad-hoc :) Some data for guesses is better than none!

I'm guessing that if US pulls their support, EU will try to add as much to cover up for it as humanly possible, as most compatriots see Ukraine as the frontline of something that can grow much, much bigger which because of remembering history, we'd obviously like to avoid.