Russian sailors pose for photos at a Chinese navy ship in Qingdao, East China's Shandong province, April 22, 2012. China and Russia launched joint naval exercises on April 22. The six days of drills by the Yellow Sea of the Pacific Ocean will last until April 27. [Photo/Xinhua]

People walk against heavy winds in Turpan, Xinjiang Uygur autonomous region on April 22, 2012. The National Meteorological Center (NMC) said Sunday that some parts in south Xinjiang Uygur autonomous region will see dust weather over the next 24 hours, with sandstorm forecasted in some regions. Strong winds of up to level 11 will accompany the sand in those areas, the NMC said. [Photo/CFP]