Reposting an article that was published today on War on the Rocks. There is widespread consensus among analysts that, although Russia and China have been moving toward closer cooperation through the entire post-Soviet era, the trend has accelerated rapidly since 2014. The specter of a Russian-Chinese partnership is deeply threatening to the United States, not only because it makes U.S. military planning more challenging, but also because it raises the possibility of two formidable adversaries joining forces to counter U.S. interests and potentially working in concert to attack U.S allies. Moreover, the two countries had a record of cooperation dating back to the early 1990s that could serve as a basis for expanded cooperation. To do so, we focused on measuring military cooperation, specifically on military diplomacy and other political aspects of the defense relationship, military-technical cooperation, and exercises and joint operations.