NATO warns Russia over Ukraine military build-up
Jens Stoltenberg urges Russia to be transparent as NATO monitors unusual' concentration of forces close to Ukraine border.
Nato chief warns Russia against 'further provocation' amid Ukraine tensions
The Nato secretary general, Jens Stoltenberg, has cautioned Moscow against "any further provocation or aggressive actions" following warnings by US officials that Russia could be preparing to a launch a winter offensive in Ukraine.
Russia Breaks Diplomatic Ties with NATO
Moscow's decision to end its diplomatic mission to the alliance will end a long post-Cold War experiment in building trust between militaries.