I wonder if there's regret in Ukraine now that they removed their deterrence capability[1]? Can there be any doubt that this wouldn't be happening if Ukraine

I wonder if there's regret in Ukraine now that they removed their deterrence capability[1]? Can there be any doubt that this wouldn't be happening if Ukraine could use nuclear weapons as a last resort? [1] http://en.wikipedia.org/wiki/Nuclear_weapons_and_Ukraine http://en.wikipedia.org/wiki/Nuclear_weapons_and_Ukraine