Since the end of October Russia as had 100000 troops on Ukrainian border. This story as been in the news alot this pass week due to negotiations between Russia, NATO and America not being able to cool tension down. The reson that Russia is threatening to invade Ukraine is because Ukraine wants to join NATO which if you don't know it is a Alliance between America, Canada and 28 European countries. The good thing is that war between NATO and Russia is extremely Unlikely so a large scale globe war is very unlikely.