I've been joking about Vlad being out of his mind, but now I am starting to get worried that he really has lost his mental health. A sane creature would realize that an assault with even the smallest nuclear weapon on earth would mean an instant and total closure from the international community and a response from all the armies in the world.
If that response is in a low level there will only be about 10 million chinese invading from the south amongst others. If it spirals off entirely, Russia will cease to exist with majority of mankind. The countries that are left will fight on who has to take the worst contaminated land areas under control.