The North American Aerospace Defense Command (NORAD) detected four Russian aircraft off of Alaska in international airspace on Thursday.

NORAD said in a statement shared with Fox News that the Russian aircraft were operating in the Alaska Air Defense Identification Zone and didn’t enter U.S. airspace. 

"The Russian aircraft remained in international airspace and did not enter American or Canadian sovereign airspace," NORAD said. "This Russian activity in the Alaska ADIZ occurs regularly and is not seen as a threat." 

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Russia bomber

In this U.S. Navy handout, a F/A-18 Hornet strike fighter intercepts one of two Russian Tu-95 Bear long rang bomber aircraft as it approached the U.S. Navy aircraft carrier USS Nimitz Feb. 9, 2008, south of Japan. (U.S. Navy via Getty Images)

The statement added, "An ADIZ begins where sovereign airspace ends and is a defined stretch of international airspace that requires the ready identification of all aircraft in the interest of national security."

Katmai National Park Alaska

NORAD said the aircraft didn't enter U.S. airspace off Alaska.  (Jean-Erick PASQUIER/Gamma-Rapho via Getty Images)

NORAD said it has a "layered defense" of satellites, airborne and ground radar and fighter jets that can "detect and track aircraft and inform appropriate actions" in such situations. 

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This week, the Russian government also released a video that claimed to show a strategic Russian bomber flying near Alaska. 

NORAD flight file image

A Russian Tu-142 maritime reconnaissance aircraft, top, is intercepted near the Alaska coastline, March 9, 2020. (North American Aerospace Defense Command via AP / File)

Similarly, in February, four Russian aircraft were detected in the Alaska ADIZ and last August. 

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The latest detection comes after the U.S. passed a comprehensive aid package that included strategic military funding to Ukraine against Russia following its 2022 invasion.