North Korea may launch nuclear test to coincide with Japan 's visit to South Korea . What more could be done ? Writers : If it 's a more serious provocation , it could signal an uptick in nuclear capability . They say strong the U.N. Security Council sanctions necessary to stop a possible march toward nukes . Writers : S. Korea must strengthen ties with North Korea and U.S. and build up its deterrent system .
North Korea may launch nuclear test to coincide with Japan 's visit to South Korea . Writers : If it 's a more serious provocation , it could signal an uptick in nuclear capability . They say strong the U.N. Security Council sanctions necessary to stop a possible march toward nukes . Writers : S. Korea must strengthen ties with North Korea and U.S. and build up its deterrent system .