This of course is the problem when dealing with Russia! We in the West have put ourselves in position of weakness by relying on Russia for Gas supplies, upset them too much and that tap can be turned off and there is nothing we can do about it except huff and puff while Russia runs rings round us!!! Why is that we in the West always seem to be negotiating from the back foot? We always seem so unrealistic when dealing with other countries whose leaders are clearly hostile to us, putting our heads in the sand, trying to pretend that it will all be alright in the end, and then seriously surprised when it isn't!!! I'm all for turning the other cheek, but sometimes it just doesn't work!
No it certainly wouldn't have been a good thing to let Russia take over Eastern Ukraine! It's not their country and they should clear off! You don't think Putin would have stopped at that. He wants the whole of the Ukraine, followed by Poland and who knows where, in fact he wants the USSR back and has made no secret of this. Appeasement never works with a bully, and once he gets away with invading one country he won't rest until he has the remainder of the old soviet block safely under his wing again. Next stop Western Europe, which will succumb without a whimper!