South Korean Defense Ministry calls the move a military provocation . It reacted angrily when 2013 's joint military exercises between South Korea and the U.S. involved stealth bombers simulating bombing attacks . North Korea launched four ballistic missiles into Yellow Sea , the South says . This may be an attempt to cut off North Korean communications , observer says . South Korea and the United States are conducting joint military exercises .
South Korean Defense Ministry calls the move a military provocation . North Korea launched four ballistic missiles into Yellow Sea , the South says . This may be an attempt to cut off North Korean communications , observer says . South Korea and the United States are conducting joint military exercises .