SEOUL, South Korea (AP) — South Korea says North Korea has fired an intercontinental ballistic missile into the sea in a resumption of its weapons testing activities. Monday’s launch is the North’s second weapons firing in less than a day. It comes as North Korea vows retaliatory steps against the U.S. and South Korea for their decision to boost their nuclear deterrence plans. South Korea’s military says North Korea launched what appeared to be a long-range ballistic missile from its capital region Monday morning. North Korea’s Defense Ministry called its rivals’ decision to include nuclear operation scenarios in their joint drills an open threat to potentially use nuclear weapons against the North.