Chinese and US navies continue to step up their deployment in the contested waters.He fears the new Aukus alliance forged by the US, UK and Australia last month could add to that risk as a key part of the pact is for Australia to develop its own nuclear submarine fleet.Speaking at an international relations forum in Beijing, Wu also said that non-binding documents signed by China and the US in 2014 on the rules of behaviour for air and maritime encounters "might not be effective in critical moments".The warning comes after USS Connecticut, an American nuclear sub, was damaged when it collided with an "uncharted seamount" in the South China Sea.
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