Four Russian aircraft were detected and intercepted over the Alaska Air Defense Identification Zone on Monday in what NORAD called a "routine" incident.
Two F-16 fighter jets were dispatched by NORAD to intercept the Russian aircraft, which included a TU-95 BEARH-H and SU-35 fighter jet.
NORAD also sent out two F-35A fighters, an E-3 Sentry, and two KC-135 Stratotankers to assist.
"Russian aircraft remained in international airspace and did not enter American or Canadian sovereign airspace. This Russian activity in the North American ADIZ occurs regularly and is not seen as a threat, nor is the activity seen as provocative," NORAD said in a statement on Tuesday.
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Since 2007, Russian aircraft have been intercepted in the North American ADIZ six to seven times a year.
Two Russian maritime patrol aircraft were detected and tracked off the coasts of Alaska and Canada in September, while a Russian surveillance plane entered the Alaska ADIZ in August.
The latest incursion comes amid increased tensions between Russia and the West over the war in Ukraine. Two Dutch F-35s intercepted Russian military aircraft near Polish airspace on Monday, according to defense officials.
The detection of Russian aircraft on Monday was not related to two unidentified objects that were shot down by NORAD last week, one in northeastern Alaska on Friday and one over Canada's Yukon territory on Saturday, according to officials.
