The plan, outlined by officials and in a written document, provides rare clarity about the extent to which the Trump administration intends to reduce its commitment to NATO.
Pressure from Washington helped drive a disputed deal forward, triggering resignations and raising questions about sovereignty.
North American Aerospace Defense Command scrambled jet fighters, AWACs and other aircraft to intercept, identify and monitor the Russians.
NORAD launched two F-16s, two F-35s, one E-3, and four KC-135s to intercept, positively identify and escort five Russian aircraft out of the zone.
NORAD launched nine fighter jets to intercept and escort the Russian warplanes