North Korea again launched ballistic missiles into the sea early Tuesday. The action appeared to be in answer to military exercises involving the United States and South Korea that begin this week. North Korea expressed anger, warning it may take a “new road” because of the exercises. In a statement, South Korea’s Joint Chiefs of Staff said North Korea fired two short-range ballistic missiles from the western part of the country. The missiles are reported to have traveled about 450 kilometers. North Korea has launched short-range ballistic missiles four times in less than two weeks. The actions have raised concerns about the possibility of lower-level talks on ending the country’s nuclear weapons program. U.S. officials had hoped those talks would begin last month, but so far a date has not been set.