Russian fighters with 'hypersonic' missiles fly over Sea of Japan

Russia's defense ministry says some of its fighter jets carrying Kinzhal missiles flew over international waters in the Sea of Japan. Moscow says the Kinzhal is a hypersonic weapon. The ministry announced on Tuesday that MiG-31 aircraft armed with the missiles conducted a planned flight and also practiced air-to-air refueling. It is unusual for Russia to make such an announcement.

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