A US-registered NATO patrol plane spent more than four hours circling Russia's westernmost Kaliningrad region from within the airspace of Poland and Estonia, an air traffic control service source told TASS. "The plane made a circular flight at an altitude of about 11 kilometers, especially crossing corridors designated for civil aviation," said the source.

A US-registered NATO patrol plane spent more than four hours circling Russia's westernmost Kaliningrad region from within the airspace of Poland and Estonia, an air traffic control service source told TASS. "The plane made a circular flight at an altitude of about 11 kilometers, especially crossing corridors designated for civil aviation," said the source.