The Russian economy is tanking due to Putin’s adventures. Putting gravy on a stinkburger doesn’t make it taste any better.
you omit time from your equation
The problem is insignificant compared to the prize of Crimea. Time will allow the economic problem to be resolved away.
Here’s the deal for now. Putin will not take eastern ukraine and the dithering west will get to claim credit. Meanwhile Crimea is forgotten and Putin wins
win: win all around