Russian Tu-95MS strategic bombers conducted a scheduled flight over the neutral waters of the Bering and Chukchi seas, the Defense Ministry said Monday.

The Russian Aerospace Forces’ long-range aircraft remained airborne for more than 13 hours and were refueled in flight, the ministry said in a statement. Su-35S fighter jets escorted the bombers, The Caspian Post reports, citing the ministry.

During some sections of the route, the aircraft were accompanied by fighter jets from other countries, the statement added.

Russian long-range aviation crews regularly conduct flights over the neutral waters of the Arctic, the North Atlantic, the Pacific Ocean, and the Baltic and Black seas, according to the ministry.

It said all flights by Russian Aerospace Forces aircraft are carried out in strict compliance with international rules governing the use of airspace.