"As for Donald Trump’s argument during the presidential campaign that America’s richer allies should pay adequately for their protection, it was a fair point in principle, but a fatal thing to say in public. It made clear that America’s commitment to NATO would not be unconditional under President Trump; and if America’s commitment is not unconditional, then fairly obviously it will not extend to nuclear war. The cat is out of the bag. Seen from Moscow, the West has not been in such inviting disarray since the Suez crisis of 1956. Whatever constraints Putin may now feel upon his land-grabbing instincts, they must be entirely domestic in nature. NATO is no longer one of them."

http://www.nybooks.com/articles/2016/12/22/russia-nato-trump-the-shadow-world/