Soldiers from the Russian Pacific Fleet's flagship Varyag visit the missile destroyer "Shenyang" of the Chinese People's Liberation Army (PLA) Navy in Qingdao, east China's Shandong Province, April 22, 2012. The April 22-27 Russia-China joint naval exercise, taking place in the Yellow Sea off China's east coast, involves a total of 16 vessels and two submarines from Chinese navy and four warships from Russian navy's Pacific Fleet as well as three supply ships being summoned for the exercise. [Xinhua]