South Korea has accused North Korea of firing artillery rounds near its disputed sea border on Friday in violation of a fragile 2018 agreement and is planning to retaliate with similar drills, according to officials. South Korea’s Joint Chiefs of Staff said that North Korea fired 200 rounds in the waters north of the disputed sea boundary.South Korea has accused North Korea of firing artillery rounds near its disputed sea border on Friday in violation of a fragile 2018 agreement and is planning to retaliate with similar drills, according to officials. South Korea’s Joint Chiefs of Staff said that North Korea fired 200 rounds in the waters north of the disputed sea boundary.