World War 3 is not likely to happen. All of the major superpowers(USA, China, and Russia) know that war wouldn't be good for either side. More than likely, everything will be worked out without war. What good would a war with the United States do Russia? It wouldn't. They know it, you know it, we all know it. It would just kill millions of people and get us absolutely nowhere..
Oh wow... you're a genius. It must be a completely new idea that war is bad for both sides... That's why we had so much war in the past, people didn't realize that!
Oh really?
Was it war that bad for the British Empire?
I really doubt it.
War is bad for you when you're not crushing your enemy fast enough, but when you do it and then you have years of "peace" when you collect the bounty in resources, I can guess war is pretty profitable and good.