North Korea said on Sunday it will reopen its border with South Korea so that tourism and family reunions can start up again. The country's news service immediately followed that announcement with a warning of "a merciless and prompt annihilating strike" if U.S. and South Korean military operations infringe the country's sovereignty. Kim Jong-Il met Friday with the leader of South Korea's Hyundai Group, who was trying to secure the release of a detained worker. The Hyundai Group runs tourism to the North and operates the Kaesong industrial park just over the border, which brings in money for Pyongyang's leadership. Normal traffic can resume to the Kaesong factory park, though it's unclear whether Hyundai buckled to Kim's demands for a payment hike for operating the park, which offers cheap labor to South Korean companies.