For much of the Cold War, China's navy was little more than an elaborate coast guard. It was barely a blip on the maritime horizons of Japan and Southeast Asia. Today the Chinese armed forces are in the midst of an intense and sustained modernization program, and the navy has emerged as a key service for protecting and advancing national interests. It gets more than one-third of the declared military budget.
China's navy, like those of other leading nations, aims to protect vital trade routes, project power and influence, and deter potential adversaries. What makes the Chinese navy significantly different is its role to secure control for China over vast sea zones and far-flung islands in Southeast Asia and Northeast Asia that are contested by several Southeast Asian countries and Japan.
China says that, like Taiwan, these areas in the South China Sea and the East China Sea are a part of its territory and were taken away when China was weak. Control of these places is contested not just for reasons of national pride, but also because they contain valuable undersea oil and gas, fisheries and some of the world's busiest and most important shipping routes that are used extensively for trade and naval operations by many countries, including the United States.