The two papers grouped together here were delivered at the Strategic Studies Institute's annual strategy conference for 2007. As the theme of the conference was global security challenges to the United States and proceeded on a region by region basis, these papers were delivered during the session devoted to security challenges issuing from what is now called Eurasia, i.e., to a large degree the former Soviet Union. The authors illustrate the degree to which great power rivalry in Eurasia has become a major security issue and source of growing Russo-American tensions. Whereas Dr. R. Craig Nation lays out some of the fundamental macro-strategic issues of this rivalry and U.S. goals in Eurasia, as well as the consequences of Russian resistance to Western and American pressures, Dr. Dmitri Trenin emphasizes the growing intensity of Russian threat perceptions.