Two U.S. fighter jets intercepted two Russian bombers in international airspace off the coast of Alaska on May 11.

The two Russian TU-95 Bear bombers flew into a so-called Air Defense Identification Zone located about 300 kilometers off Alaska’s west coast, according to a spokesman for the North American Aerospace Defense Command in a statement to CNN on May 12.

Two F-22 fighter jets intercepted and visually identified the Russian bombers until they left the zone. The Russian aircraft never entered U.S. airspace, CNN reported, citing the statement.

Russian bombers were escorted by two F-22 fighter jets in international airspace for 40 minutes, the RIA Novosti news agency cited the Russian Defense Ministry as saying on May 12.

The U.S. fighter jets did not get closer than 100 meters to the Russian bombers, the Russian military was quoted as saying.

Encounters between Russian and U.S. as well as NATO warplanes have increased as Moscow has demonstrated its resurgent military might.

Russia also has increased its naval presence in the Mediterranean, Black Sea, and other areas.

In January, a Russian Su-27 came within 1.5 meters of a U.S. Navy surveillance plane while it was flying in international airspace over the Black Sea.

Russia has increased its military presence in the area since it annexed Crimea in 2014.

There have also been interactions between the United States and Russia in the skies above Syria, where the nations support differing sides in the ongoing civil war.

In December 2017, two U.S. F-33 Stealth fighter jets fired warning flares after Russian Su-25 jets entered an agreed deconfliction area in Syrian airspace.

Such incidents have added tension to Russia's relationship with the West, which has been severely strained by Moscow's takeover of Crimea, its support for separatists in eastern Ukraine, and its alleged meddling in the U.S. election in 2016, among other things.

With reporting by AP, CNN, Interfax, RIA Novosti, and TASS