Killing one person is murder, killing 100,000 is foreign policy
Russia is going to do this no matter who is in charge because they know the risk calculations and it came out in their favor in short of all out war.
I personally would rather lose Crimea than potentially millions of lives and every indication is that Putin is willing to go to this level of conflict.
But given the geopolitical situation, if Europe alights than a bunch of the world is going to take advantage of the distraction and fight wars of their own.
Israel will go to war with the Middle East for example. China will begin to gobble up the terrify they want too. It's potentially a huge mess.
The whole modern world has divided itself into Conservatives and Progressives. The business of Progressives is to go on making mistakes. The business of Conservatives is to prevent mistakes from being corrected.