NBC News points out that it's not uncommon for these events to occur, and Russian aircraft have been accused several times of violating the airspace of America's North Atlantic Treaty Organisation allies and flying dangerously close to USA ships and aircraft in the Black Sea.
Such intercepts have happened about 60 times between 2007 and 2017, The New York Times reported a year ago.
For the second time in less than two weeks, Russian aircraft have flirted with United States airspace near Alaska.
The Russian Tu-95 bombers, accompanied by two Russian Su-35 fighter jets, were intercepted west of mainland Alaska at around 10:00 p.m. EDT on Tuesday (0200 GMT, Wednesday), said the North American Aerospace Defense Command in a statement.
The Tu-95 "Bear" bombers and a pair of Su-35 "Flanker" fighters - advanced aircraft that entered the Russian arsenal in 2014 - were discovered in global airspace west of Alaska at about 10 p.m. Tuesday, NORAD said in a statement Wednesday.
During the September 1 bomber incursion, the Tu-95s were not shadowed by Russian jets.
The Russian jets never entered USA or Canadian airspace, NORAD said, but it didn't give a precise location as to how close they had come.
"NORAD employs a layered defense network of radars, satellites, as well as fighters to identify aircraft and determine the appropriate response", he added.
No other details of the intercept were disclosed.
On Sept. 1, two F-22 fighters intercepted Russian bombers flying in the Air Defense Identification Zone south of the Aleutians, NORAD said in a written statement.
The latest Bear bombers incursion coincided with the start of Russian war games known as Vostok-18 that Russian officials have said are the largest since 1981.
A previous interception of bombers occurring on September 1 involved bombers without any Russian fighter jet escorts, CNN noted.