North Korea fired two additional suspected short-range missiles into the sea Monday amid ongoing military exercises between Seoul and Washington, which the North calls a preparation for an attack, South Korean officials said, according to AP. The launches appear to be in protest of the drills and to test North Korea's weapons systems. They followed South Korea's announcement that North Korea last Thursday fired four short-range Scud missiles with a range of more than 200 kilometers (about 125 miles) into the North's eastern waters. On Monday, two projectiles blasted from the North's east coast flew about 500 kilometers (310 miles) before landing in the high seas, South Korean Defense Ministry spokesman Kim Min-seok told reporters.