(Newport, RI) -- The Naval War College in Newport was the site of a military leader talking about threats from Russia and China for the second time in less than a week on Friday. U.S. Defense Secretary James Mattis, speaking to this year' graduating class, warned that Russia and its president, Vladimir Putin, are attempting to undermine the moral authority of the United States and criticized Russia's military actions in Crimea and Ukraine. Mattis also expressed the belief that China is seeking to reproduce its authoritarian model elsewhere as it expands. The Secretary of the Navy and the Chief of Naval Operations also talked about their concerns with those two countries last week at a strategy forum hosted at the college.