It's worth noting that the Russians have already set precedent for denying access to their air space under this treaty by canceling scheduled US surveillance fl

It's worth noting that the Russians have already set precedent for denying access to their air space under this treaty by canceling scheduled US surveillance flights during the build up on the Crimean border. http://m.washingtontimes.com/news/2014/apr/17/russia-blocks-us-treaty-approved-spy-flights/ http://m.washingtontimes.com/news/2014/apr/17/russia-blocks-...