The North American Aerospace Defense Command (NORAD) intercepted four Russian bombers near Alaska on Tuesday, according to multiple news reports.

The Russian aircraft were intercepted by U.S. Air Force jets near Alaska’s Air Defense Identification Zone (ADIZ). NORAD said the bombers were on a “routine” patrol and were not considered a threat.

Sen. Dan Sullivan (R-Alaska) confirmed that the Russian bombers were patrolling the Bering Sea. Sullivan said that while the incident was not considered a threat, it was a reminder of the importance of U.S. military presence in the region.

The incident comes just weeks after a similar incident in which two Russian bombers were intercepted by NORAD near Alaska. At the time, NORAD said the aircraft were on a “routine” mission and were not considered a threat.

The U.S. has long maintained a military presence near Alaska and the Arctic region, and the recent Russian bomber patrols have increased tensions between the two countries.

The U.S. and Russia have long been at odds over the Arctic region, with both countries making claims to the region’s resources. This incident is likely to further increase tensions between the two countries.