Four more years, or maybe ten more years depending on which side of the Pacific you reside. This year saw the closest alignment of both US and Chinese political transitions since 1992. While the US election is now bygone news, replaced by the “Fiscal Cliff”, Petraeus-gate, and the odd-call for Texan succession, news is still fresh of China’s new leader Xi Jinping. Recently appointed by the Chinese Communist Party’s Central Committee, Xi will (if everything goes according to plan) reside in China’s top position for the next 10 years. Within this time frame, 4 years for Obama, and 10 years for Xi, both the US and China should work to expand nuclear disarmament cooperation. Though there are many avenues for cooperation, China and the US should focus their energy on the Comprehensive Nuclear-Test-Ban Treaty (CTBT). The CTBT stipulates that ratifiers must refrain from nuclear explosions and encouraging other countries to test their weapons. This second aspect is very important since a ratifier could merely give their weapons to second party to be tested outside of their borders. For China and the US, ratification of the CTBT could give bilateral disarmament an overdue jolt. Unlike Russia and the US, who partnered on the successful START treaties, China and the US do not have a strong disarmament relationship outside of the Non-Proliferation Treaty. The CTBT, if ratified by the US and China, could lay the groundwork for further disarmament cooperation by adding the most important ingredient in negotiations: trust. The CTBT would not limit arms or capabilities but, it would lay the foundation for later reductions. Furthermore, as both countries face the economic headwinds of the 21st century, it is important to consider the cost of maintaining 20th century testing infrastructure. Lastly, China should consider its neighborhood. Asia is the most nuclearized region in the world. Stretching from Pakistan to the west and North Korea to the east, China is surrounded. When a country such as North Korea tests its weapons China’s air, soil and water will suffer.