U.S. military officials tell NBC News that two Russian bombers, capable of carrying nuclear cruise missiles, circled the U.S. island of Guam in the Western Pacific this week. U.S. Air Force F-15 jets scrambled from Andersen Air Force Base on Guam to intercept the bombers.

According to one military official, the Russian Bear bombers remained in international airspace, the encounter between the U.S. and Russian aircraft “stayed professional” and there was no incident. The official said it’s impossible to determine whether the Russian bombers carried any nuclear weapons. …

U.S. military officials say “it’s highly unusual but not unprecedented” that Russian bombers would fly training missions in the vicinity of Guam.