Chinese President Xi Jinping (R) meets with U.S. President Barack Obama in St. Petersburg, Russia, Sept. 6, 2013. Xi Jinping held talks with Barack Obama on the sidelines of the eighth Group of 20 summit. Later this month, Xi will pay his first state visit to the U.S. since he took office in 2013. Here are four major meetings between Xi and Obama since 2013. (Xinhua/Ju Peng)