The South Korean military said the North fired at least 17 short-range ballistic and other missiles from several sites in the morning.The military said one of the three short-range ballistic missiles launched in or around Wonsan in the east between 8 a.m. and 9 a.m. crossed a maritime boundary called the Northern Limit Line or NLL, which was set by UN forces.South Korea's Joint Chiefs of Staff denounced North Korea, saying it is the first time that a North Korean missile has crossed the NLL and fallen near the country's territorial waters since the division of the two Koreas.In a rare move, South Korean fighter jets fired three air-to-surface missiles toward international waters on the northern side of the NLL.North Korea's missile launches come as South Korea and the United States are jointly conducting large-scale air force drills."