In situations like these, I believe the best thing a distant westerner can do to weight against escalation is to keep cold headed, try our best not to fall prey to endoctrination, remind anyone involved to not burn bridges, to never consider others are fundamentally different, etc.
If we were in Kyiv right now it could be different, but maybe not. Actually, the Russian invasion has been very low intensity so far and to be frank, if not for the nonstop calls for more action from warmongers on the internet, I would still believe we are still well within the range of peace negociations.
I'm conscious how naive this sounds, but after all the Putins and the Bushs can only go to war when their people are filled with enough hatred, that's the first ammo that's ever manufactured.