North Korea showed off a new submarine-launched ballistic missile (SLBM) during a military parade, state media said Friday, revealing yet another weapon experts say is likely to put Japan in its crosshairs and lay the foundation for a longer-range solid-fueled rocket.

The North held its second military parade since October on Thursday night, the state-run Korean Central News Agency (KCNA) said, with photos showing leader Kim Jong Un, a wide grin on his face, overseeing rows of troops and weapons.

The parade came after the closing of a rare party congress that saw Kim pledge to continue his country’s nuclear weapons development, in a shot across the bow of the incoming administration of U.S. President-elect Joe Biden.