The missile was fired from waters near the eastern port city of Sinpo, the country's first demonstration of a submarine-fired ballistic system since October last year.
The "unidentified projectile" fired toward the East Sea is presumably a long-range ballistic missile, Seoul and Tokyo said, amid fears that Pyongyang could be preparing to test-fire an ICBM.
Pyongyang displays previously unseen intercontinental ballistic missiles at an unprecedented pre-dawn military parade to mark 75th anniversary of ruling Workers' Party.
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