Actually @Weeg wouldn't a nuclear attack also wipe out Putin's own Russian army? Plus it'd make millions of Russians living near the Ukraine border sick or dead too. That's what happened with Chernobyl.
There's no way to contain the fallout from nuclear radiation. Even people living thousands of miles away would be infected or affected. It'd be horrible.
It's like when I tell people about how dangerous China is. People here dream of eating sirloin and drinking beer everyday (the commie thief ran his campaign saying that) while the Chinese simply want land to live and grow food.