Leaders of Shanghai Cooperation Organization, (L-R) Russian President Vladimir Putin, Kazakhstan's President Nazarbayev, China's President Hu Jintao, Tajikistan's President Imomali Rakhmonov and Kyrgyzstan's President Kurmanbek Bakiyev pose with observers Iranian President Mahmoud Ahmadinejad and Pakistan President Pervez Musharraf. The leaders of China, Russia and four Central Asian nations have begun their annual summit in Shanghai with Iran's nuclear program threatening to crowd out all other agenda items(AFP/MARK Ralston)