North Korea bolsters arsenal with 'world's strongest weapon'

SEOUL -- North Korea on Thursday displayed what it called "the world's strongest weapon" at a grand military parade in Pyongyang to mark the close of the isolated nation's Eighth Party Congress.

The unveiling of a new submarine-launched ballistic missile (SLBM) a week before the inauguration of Joe Biden as U.S. president shows North Korea is adopting an assertive posture toward the incoming administration.