US President Barack Obama (R) and Chinese President Xi Jinping take a walk at the Annenberg Retreat at Sunnylands in Rancho Mirage, California, on June 8, 2013. Obama and Xi wrap up their debut summit Saturday, grasping for a personal understanding that could ease often prickly US-China relations. Skipping the usual summit pageantry, Obama and Xi went without neckties, in a departure from the stifling formality that marked Obama&#39;s halting interactions with China&#39;s ex-president Hu Jintao. AFP PHOTO/Jewel Samad