Sino-Japanese ties have soured dramatically since Tokyo nationalised some of the Senkaku islands, which Beijing claims and calls the Diaoyus, in the East China Sea a year ago.
China also claims almost all of the South China Sea including waters close to its neighbours' coasts, and tensions with the Philippines and Vietnam have intensified in recent years.
Washington has security alliances with both Tokyo and Manila, but Wang Guanzhong, a senior officer of China's People's Liberation Army (PLA), this week warned visiting US counterparts that it should handle issues "appropriately" to avoid damaging "mutual strategic trust".
"The United States should maintain a consistent stance and policy, not send wrong signals that support or connive with relevant countries to act on their own initiative," Wang said.
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China's military was determined to defend the country's territory and maritime interests, although Beijing has exercised restraint while dealing with the disputes, he added.
"We strongly believe that any and all maritime disputes should be resolved without the threat or use of force," he said. "For East China Sea and South China Sea we reminded the Chinese we have treaty obligations with a number of the parties involved."
Chinese vessels frequently patrol near the disputed East China Sea islands, and Beijing humiliated Manila last year by taking effective control of the disputed Scarborough shoal, just 200 kilometres from the Philippines.
The Philippines said in June it was looking to give the US -- its former colonial ruler -- and Japan greater access to its military bases, as it seeks to counter what it perceives as a growing threat from China.
Fan Changlong, one of China's three most senior military officers, called on the PLA to "speed up various preparations for sea battles" and "improve maritime deterrence and combat capabilities" while inspecting navy units recently, the official Xinhua news agency reported yesterday.