North Korea is preparing to open a key nuclear site to international inspectors, according to South Korean intelligence. North Korea had previously barred inspections, which became a sticking point in ongoing discussions between Pyongyang and Washington over a North Korean denuclearization agreement. This comes as the inter-Korean military agreement goes into effect today, banning all hostile activities between the two Koreas. South Korean Defense Minister Jeong Kyeong-doo and U.S. Defense Secretary James Mattis also said Wednesday the U.S. and South Korea are considering canceling joint military exercises, after a meeting at the Pentagon Wednesday.