North Korea may launch nuclear test to coincide with Obama 's visit to South Korea . Writers : If it 's a more serious provocation , it could signal an uptick in nuclear capability . Comment: Moving China to action has usually been a challenge , but additional North Korean provocations and Kim Jong Un 's execution of his uncle and China 's contact in Pyongyang , Jang Song Thaek , could motivate China to take steps , particularly once it is clear that the U.S. is no longer willing to rely on the Security Council for another round of weak sanctions . Writers : U.S. must strengthen ties with S. Korea and Japan and build up its deterrent system .
North Korea may launch nuclear test to coincide with Obama 's visit to South Korea . Writers : If it 's a more serious provocation , it could signal an uptick in nuclear capability . Comment: Writers : U.S. must strengthen ties with S. Korea and Japan and build up its deterrent system .