SEOUL, South Korea (AP) — South Korea’s military says North Korea has flight-tested a ballistic missile that was likely fired from a submarine, continuing a provocative streak in weapons demonstrations that may culminate with a nuclear test in the coming weeks or months. The launch came three days after South Korea and Japan detected a suspected ballistic missile fired from near the North Korean capital. Both exercises come ahead of the inauguration on Tuesday of South Korean President-elect Yoon Suk Yeol, who has vowed to take a tougher approach over the North’s nuclear ambitions. So far this year, North Korea has fired missiles 15 times. Experts say leader Kim Jong Un appears to be preparing to test a miniaturized nuclear device that it can use to arm its submarine-launched missiles.