Photo taken on Sept. 8, 2011 shows an aircraft and ships participating in the Sino-Russian border river emergency drill along a stretch of the Heilongjiang River which marks part of the boundary between China and Russia, near Heihe City, northeast China's Heilongjiang Province. The joint border river emergency drill was held by Heilongjiang Province and Russia's Amur Region. Nearly 250 personnel and 41 boats from both sides participated in the drill. [Xinhua/Song Fulai]