South Korean President Moon Jae-in made a good start to the new year. Not only did he broker an agreement to bring North Korea to the Winter Olympic Games in Pyeongchang; he convinced U.S. President Donald Trump that doing so was in fact Trump's idea.

With his Olympic coup, Moon both managed the North Korean threat to the games and avoided any backlash from the United States. Still, the agreement that North and South Korea reached in the border village of Panmunjom last month is unlikely to lead to renewed nuclear disarmament talks.

Rather, once the games are over, the North will likely use the current diplomatic opening to probe in other areas unrelated to its nuclear program, which, in turn, will raise a set of trying and familiar issues for the U.S.-South Korea relationship.