The rise of China is not the only distinguishing structural factor for the strategic environment in which the United States finds itself. Many scholars will discuss the role of terrorism, increased globalization, and non-state actors in the current strategic environment. These are all important, but from a classical view of the structure of the international system, what the U.S. today is facing is not just a rising power, or even a bloc of powers: it is also facing a declining power—Russia.