A Russian MiG-31 fighter jet has been scrambled to escort a U.S. B-1B strategic bomber over the Sea of Japan, TASS news agency reported on Sunday citing the Russian military, just days after an incident with a U.S. naval destroyer in the same region.

It said the bomber had not breached the Russian border.

Russia said on Friday one of its military vessels chased away a U.S. destroyer that attempted to violate Russian territorial waters during Russian-Chinese naval drills in the Sea of Japan, something Washington said was false.