The West in general can't endure much because it's no longer used to it, <<unless>>, and this is super important, that pain comes from a clear, mortal threat. In which case democracies are at least as resilient, probably more resilient, that dictatorships, because the decision making is spread around more and more individuals decide it's bad for them if the other side wins.

With Russia at least several countries (Eastern and Northern Europe) decided that Russia is a clear, mortal threat and they're lobbying the bigger and less decided actors (US, Western Europe) to hold the line.

With China, in case of a conflict, alarm bells would go off around the world, much more than for Russia. The US population is quite apprehensive of the PRC regime, already. In Europe a similar thing is happening.

I hope nothing happens, but I think people will be shocked how quickly the hostility ramps up if we get to it, even from people they wouldn't expect.