China-Hu-diplomacy-trade,ADVANCER by Andrew Beatty This file photo... News PhotoBarack Obama,Chinese President,G20 Leaders' Summit,G20 Summit,Group of 20,Hand,Handshake,Horizontal,Hu Jintao,Meeting,Politics,Seoul,Shaking,Showing,South Korea,Summit,US PresidentPhotographer Collection: AFP 2011 AFPTO GO WITH US-China-Hu-diplomacy-trade,ADVANCER by Andrew Beatty(FILES) This file photo taken on November 11, 2010 show US President Barack Obama (L) shaking hands with Chinese President Hu Jintao during their bilateral meeting in Seoul ahead of the start of the G20 summit. Presidents Barack Obama and Hu Jintao will try to patch up frayed economic ties when they meet in Washington next week, but a far-reaching power shift hangs uneasily over the meeting. AFP PHOTO / FILES / TIM SLOAN (Photo credit should read TIM SLOAN/AFP/Getty Images)