If you're looking to improve your Mandarin skills while increasing your knowledge of U.S.-China relations, we highly recommend exploring the resources offered by the American Mandarin Society.
AMS is a Washington, D.C.-based nonprofit dedicated to supporting the development of the future stewards of the U.S.-China relationship. Beyond a weekly newsletter, they produce a podcast that provides a selection of audio recordings from recent AMS lectures in Washington, D.C., as well as readings from key policy documents often featured in AMS weekly newsletters. You can sign up for the newsletter at www.mandarinsociety.org.
The American Mandarin Society is a resource anyone serious about Mandarin learning should use to the fullest advantage.
Happy learning!