South Korea on Sunday urged North Korea to commit to its past disarmament pledges while expressing concerns over the North’s unveiling of a suspected new long-range missile during a military parade. During celebrations marking the 75th birthday of its ruling party in Pyongyang on Saturday, North Korea paraded a variety of weapons systems, including two missiles that were disclosed for the first time to a foreign audience. One is what appeared to be an intercontinental ballistic missile that is larger than any of the North’s known ICBMs, and the other would likely be an upgraded version of a missile that can be fired from submarines.