A Chinese nuclear submarine designed to carry missiles that can hit the U.S. is likely to deploy before year’s end, the Pentagon said, adding to Obama administration concerns over China’s muscle-flexing in Asia.

China’s navy is expected this year to conduct the first patrol of its Jin-class nuclear-powered submarine armed with JL-2 submarine-launched ballistic missiles, the Pentagon’s Defense Intelligence Agency said in a statement. It declined to give its level of confidence on when the new boat will be deployed, or the status of the missile.

“The capability to maintain continuous deterrent patrols is a big milestone for a nuclear power,” Larry Wortzel, a member of the congressionally created U.S.-China Economic and Security Review Commission, said in an e-mail. “I think the Chinese would announce this capability as a show of strength and for prestige.”

… “Don’t discount the likelihood of threat inflation by the Pentagon because of the shift toward the Asia-Pacific in the revised maritime strategy,” said Collin Koh Swee Lean, an associate research fellow at the S. Rajaratnam School of International Studies in Singapore.