The aircraft never actually left global airspace, but a NORAD spokesperson stated that, on Thursday, they dispatched US and Canadian jets "to perform an intercept".
According to information provided by NORAD, U.S. aircraft have intercepted Russian planes about 60 times since 2007.
Former state department staffer Howard Stoffer told CNN the frequent military flights are part of Russian President Vladimir Putin's larger strategy "to prove Russia is back in the game", suggesting Putin is "is trying to put the USA on notice that the Russians are everywhere and are back to expanding the limits of expanding their military power". American territorial airspace begins 12 nautical miles from American shores.
The Russian aircraft was in global air space at the time, abiding by worldwide law, she said.
Pentagon officials said they believed the Russians were testing the U.S. Air Force's response to their bomber flights.
Last Monday was the first time in over two years that Russian military aircraft have flown this close to the USA mainland. It was "an attempt to come up as close as they could to our global borders to see what our reaction would be".
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USA officials told CNN this kind of "cat and mouse" interaction by the Russian air force is not unprecedented, but hasn't occurred since 2015.
The first incident happened Monday night, when two nuclear-capabe Tu-95 Bear bombers were intercepted by American F-22 fighter jets about 100 miles off the coast of Kodiak Island.
Russian aircraft on Friday reportedly flew near Alaska for fourth time in four days.
Wednesday night a pair of Russian spy planes Ilyushin IL-38s flew near the Aleutian Islands in the Bering Sea staying in the U.S. Air Defense Zone for a few hours before departing.
The latest round of flights began Monday night, when two Bear bombers were tracked near Alaska, prompting the scramble of two U.S. F-22s to intercept them.
The mid-air incidents comes just days after secretary of state Rex Tillerson said U.S. and Russian relations had reached a "low point".