(Reuters) China appears to be within two years of deploying submarine-launched nuclear weapons, adding a new leg to its nuclear arsenal that should lead to arms-reduction talks, a draft report by a congressionally mandated U.S. commission says.

China in the meantime remains “the most threatening” power in cyberspace and presents the largest challenge to U.S. supply chain integrity, the U.S.-China Economic and Security Review Commission said in a draft of its 2012 report to the U.S. Congress.

China is alone among the original nuclear weapons states to be expanding its nuclear forces, the report said. The others are the United States, Russia, Britain and France.

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