Fire your Russian employees.

Then withdraw.

Hurts but if history should learn us a thing or two one of them should be not to give in to dictators.

The younger ones here are allowed to take a few minutes off to use their favorite search engine to look up the quote "peace in our time" by Chamberlain.

Edit:

It looks so simple the way I wrote it above. Please note that doing the right thing isn't easy. Telling lots of people their job is gone. Telling investors the money invested in one of the most promising markets is gone etc etc.

But I am afraid that sooner or later the alternative will be worse.