NEW : The Korean People 's Army `` will deal the second and third unpredictable self-defensive blow at them to protect the inviolable territorial waters of '' North Korea `` as it had declared before the world . '' Russian Foreign Ministry urges United States and South Korea to call off military exercises . Military drill on Yeonpyeong Isand resulted shelling by North Korea , two deaths . North Korea says it will deliver a ` ` self - defensive blow '' to the South if military exercise takes place . Yeonpyeong Island is a flashpoint between the Koreas .
NEW : Russian Foreign Ministry urges United States and South Korea to call off military exercises . Military drill on Yeonpyeong Isand resulted shelling by North Korea , two deaths . North Korea says it will deliver a ` ` self - defensive blow '' to the South if military exercise takes place . Yeonpyeong Island is a flashpoint between the Koreas .