SEOUL - North Korea is making progress on developing its KN-11 submarine-launched ballistic missile (SLBM). Pyongyang has shifted from liquid- to a solid-fuel engine for the KN-11. In addition, North Korea is pushing forward with development of its Gorae-class ballistic missile submarine.
North Korea's SLBM appears to mimic characteristics of the first generation U.S.-made Polaris missile. Five tests of the KN-11 were carried out last year.
Tensions remain high in the region amid a war of words between Washington and Pyongyang.