Of course it is in their interest. The problem is that Russia only knows how to bully, oppress, or violently interfere with their neighbors.
You cannot get along with a tiger who only regards you as a meal.
That's blatantly false. Look at the map, Russia has good relations with majority of its neighbours. It is only NATO and its vassals Russia has got sour relations and for that NATO has nobody else to blame than themselves. Had Russia been integrated into European security/economic structures from day one, we wouldn't be in the current mess.
Also it's in the EU interest to sanction russia to the bankruptcy, wait for implosion and buy for pennies all available resources.
Doubt it. Appeasing hasn't worked. I don't know what would, but polishing Putin's shoes doesn't help. As for the US, least they have the chance to oust their emperor in three years.