SEOUL—The U.S., Japan and South Korea pledged to consider new unilateral steps to pressure North Korea after its fifth nuclear test, but their options are limited by a lack of economic and diplomatic ties to Pyongyang. On Sunday, the top U.S. envoy on North Korea said the three nations would work together at the United Nations on action against Pyongyang, as well as study their own individual penalties. “In addition to...

Source: Wall Street Journal September 11, 2016 10:30 UTC