North Korea said it successfully refloated a 5,000-ton destroyer that suffered damage in a botched launch attempt last month that left it foundering in shallow water, with leader Kim Jong Un vowing to build two more vessels of the same class next year as part of his efforts to boost the country’s naval capabilities.

A second launch ceremony for the Choe Hyon-class destroyer Kang Kon took place at the northeastern port of Rajin on Thursday, state media Korean Central News Agency said, less than a month after reporting a "serious accident” during the first attempted launch of the ship in May.

"Despite the difficulties and obstacles, our massive shipbuilding plans aimed at building advanced naval power are being pushed forward at the fastest pace possible,” Kim said in a speech at the ceremony.