@AnthonyFStevens
Meh, we would beat Russia back from Ukraine if we really sent troops, it just wouldn't be painless.
The full counter invasion all the way to Moscow is of course a much more challenging prospect, probably not possible without going to full war economies and total mobilization if the Americans don't join. But also that is obviously a much different thing from merely deterring Russia from invading the EU propper.
The big problem with the US dropping out of NATO is a loss of capability to invade distant countries beyond the EU border, and of course that the US would consider strikes on EU territory.
@Remittancegirl @Eetschrijver