North Korea fired an unidentified projectile eastward on Friday, the South Korean military announced, hours after Pyongyang warned of "stronger and certain reaction" following new sanctions imposed by the United States.

The brief statement from Seoul's Joint Chiefs of Staff did not provide further information on the launch, but Japan's government said it could be a ballistic missile.

On Jan. 5 and 11, the North Korean regime fired what it claims were hypersonic missiles, although Seoul and Tokyo have insisted in their analyses that they were ballistic missiles that show great maneuverability.

Friday's launch comes hours after Pyongyang warned it would take "stronger and certain reaction," in response to the United States imposing new sanctions over its missile tests.