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Congress has long been concerned about whether U.S. policy advances the national interest in reducing the role of the People's Republic of China (PRC) in the proliferation of weapons of mass destruction (WMD) and missiles that could deliver them. Recipients of China's technology reportedly included Pakistan, North Korea, and Iran. This CRS Report discusses the security problem of China's role in weapons proliferation and issues related to the U.S. policy response since the mid-1990s. China has taken some steps to mollify U.S. and other foreign concerns about its role in weapons proliferation. Nonetheless, supplies from China have aggravated trends that result in ambiguous technical aid, more indigenous capabilities, longer-range missiles, and secondary (retransferred) proliferation.PRC proliferation activities have continued to raise questions about China's commitment to nonproliferation and the need for U.S. sanctions. The United States has imposed sanctions on various PRC "entities" (including state-owned entities) for troublesome transfers related to missiles and chemical weapons to Pakistan, Iran, or perhaps another country, including repeated sanctions on some "serial proliferators." Since 2009, the Obama Administration has imposed sanctions on 16 occasions on multiple entities in China for weapons proliferation. Skeptics question whether China's roles in weapons nonproliferation warrant a closer relationship with China, even as sanctions were required on some PRC technology transfers. Some criticize the imposition of U.S. sanctions targeting PRC "entities" but not the government. Others doubt the effectiveness of any stress on sanctions over diplomacy or a comprehensive strategy. Concerns grew that China expanded nuclear cooperation with Pakistan, supported North Korea, and could undermine sanctions against Iran (including in the oil/gas energy sector).