US Secretary of State John Kerry (L) speaks with Chinese state councilor Yang Jiechi (R) during a meeting at the Diaoyutai State Guesthouse in Beijing on April 13, 2013. US Secretary of State John Kerry on April 13 pressed North Korea’s patron China to help defuse sky-high nuclear tensions, telling President Xi Jinping the world was facing a “critical” moment. AFP PHOTO / POOL / Paul J. Richards