U.S. and Canadian fighter jets intercepted two Russian reconnaissance planes near Alaska on Monday, flying with the foreign aircraft for hours until they finally withdrew, military officials said.

American F-22 Raptor stealth jets and Canadian CF-18 Hornets escorted the two Tupolev Tu-142 maritime reconnaissance aircraft for the duration of their four-hour flight over the Beaufort Sea, North American Aerospace Defense Command [NORAD] officials said in a statement.

The Russian aircraft entered the Alaskan Air Defense Identification Zone and remained in international airspace for the duration of the flight, the joint U.S.-Canadian command said, adding that the planes never entered U.S. or Canadian sovereign airspace.

PAKISTAN FIGHTER JET CRASHES IN ISLAMABAD WHILE REHEARSING AEROBATICS, PILOT DIES: OFFICIALS

“NORAD continues to operate in the Arctic across multiple domains,” NORAD Commander Gen. Terrence J. O’Shaughnessy said in the statement. “As we continue to conduct exercises and operations in the north, we are driven by a single unyielding priority: defending the homelands.”

A KC-135 Stratotanker refueling aircraft and E-3 Sentry AWACS [airborne warning and control system] aircraft supported the NORAD fighter jets, officials said.

The Russian aircraft flew as close as 50 nautical miles to the Alaskan coast, according to officials.

They likely were closest to Utqiagvik, the northernmost city in the U.S. and formerly known as Barrow, Capt. Cameron Hillier, a NORAD spokesman at Peterson Air Force Base in Colorado Springs, Colo., told The Associated Press.

Russian aircraft flying near Alaska or Canada has been fairly routine, with the last occurring in January.

CLICK HERE FOR THE FOX NEWS APP

Hillier said such incursions have happened on average from five to seven times each year since Russia restarted the practice in 2007.

The Associated Press contributed to this report.