North Korea says it has successfully test-fired a ballistic missile from a submarine and strengthened its nuclear attack capabilities.
朝鲜称已从潜艇上成功试射弹道导弹,并加强了其核攻击能力。
Hours before the announcement by North Korea's state media Sunday, South Korean military officials said the North had fired what appeared to be a ballistic missile from a submarine off its eastern coast.