After the terrorist attacks on September 11, 2001, the United States faced a challenge in enlisting the full support of the People's Republic of China (PRC) in the counterterrorism fight against Al Qaeda. This effort raised short-term policy issues about how to elicit cooperation and how to address PRC concerns about the U.S.-led war (Operation Enduring Freedom). Longer-term issues have concerned whether counterterrorism has strategically transformed bilateral ties and whether China's support was valuable and not obtained at the expense of other U.S. interests.

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 include Pakistan and countries said by the State Department to have supported terrorism, such as Iran. This CRS Report, updated as warranted, 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. According to unclassified intelligence reports submitted as required to Congress, China has been a "key supplier" of technology, particularly PRC entities providing nuclear and missile-related technology to Pakistan and missile-related technology to Iran.

The purpose and scope of this CRS report is to provide a succinct overview with analysis of the major issues in the U.S. policy on Taiwan. This report will be updated as warranted. Taiwan formally calls itself the sovereign Republic of China (ROC), tracing its political lineage to the ROC set up after the revolution in 1911 in China. The ROC government retreated to Taipei in 1949. The United States recognized the ROC until the end of 1978 and has maintained a nondiplomatic relationship with Taiwan after recognition of the People's Republic of China (PRC) in Beijing in 1979. The State Department claims an "unofficial" U.S. relationship with Taiwan, despite official contacts that include arms sales. The Taiwan Relations Act (TRA) of 1979, P.L. 96-8, has governed policy in the absence of a diplomatic relationship or a defense treaty. Other key statements that guide policy are the three U.S.-PRC Joint Communiques of 1972, 1979, and 1982; as well as the "Six Assurances" of 1982. (See also CRS Report RL30341, China/Taiwan: Evolution of the "One China" Policy-Key Statements from Washington, Beijing, and Taipei.)

The purpose and scope of this CRS report is to provide a succinct overview with analysis of the issues in the U.S.-Taiwan relationship. This report will be updated as warranted. Taiwan formally calls itself the sovereign Republic of China (ROC), tracing its political lineage to the ROC set up after the revolution in 1911 in China. The ROC government retreated to Taipei in 1949. The United States recognized the ROC until the end of 1978 and has maintained a non-diplomatic relationship with Taiwan after recognition of the People's Republic of China (PRC) in Beijing in 1979. The State Department claims an "unofficial" U.S. relationship with Taiwan, despite official contacts that include arms sales. The Taiwan Relations Act (TRA) of 1979, P.L. 96-8, has governed policy in the absence of a diplomatic relationship or a defense treaty. Other key statements that guide policy are the three U.S.-PRC Joint Communiques of 1972, 1979, and 1982; as well as the "Six Assurances" of 1982. (See also CRS Report RL30341, China/Taiwan: Evolution of the "One China" Policy-Key Statements from Washington, Beijing, and Taipei.)

This report, updated as warranted, discusses U.S. security assistance to Taiwan, or Republic of China (ROC), including policy issues for Congress and legislation. Congress has oversight of the Taiwan Relations Act (TRA), P.L. 96-8, which has governed arms sales to Taiwan since 1979, when the United States recognized the People's Republic of China (PRC) instead of the ROC. Two other relevant parts of the "one China" policy are the August 17, 1982, U.S.-PRC Joint Communique and the "Six Assurances" to Taiwan. U.S. arms sales to Taiwan have been significant. The United States also expanded military ties with Taiwan after the PRC's missile firings in 1995-1996. However, the U.S.-ROC Mutual Defense Treaty terminated in 1979.

This report, updated as warranted, discusses U.S. security assistance to Taiwan, or Republic of China (ROC), including policy issues for Congress and legislation. Congress has oversight of the Taiwan Relations Act (TRA), P.L. 96-8, which has governed arms sales to Taiwan since 1979, when the United States recognized the People's Republic of China (PRC) instead of the ROC. Two other relevant parts of the "one China" policy are the August 17, 1982, U.S.-PRC Joint Communique and the "Six Assurances" to Taiwan. U.S. arms sales to Taiwan have been significant. The United States also expanded military ties with Taiwan after the PRC's missile firings in 1995-1996. However, the U.S.-ROC Mutual Defense Treaty terminated in 1979.

Despite apparently consistent statements in four decades, the U.S. "one China" policy concerning Taiwan remains somewhat ambiguous and subject to different interpretations. Apart from questions about what the "one China" policy entails, issues have arisen about whether U.S. Presidents have stated clear positions and have changed or should change policy, affecting U.S. interests in security and democracy. In Part I, this CRS Report, updated as warranted, discusses the "one China" policy since the United States began in 1971 to reach presidential understandings with the People's Republic of China (PRC) government in Beijing. Part II records the evolution of policy as affected by legislation and key statements by Washington, Beijing, and Taipei. Taiwan formally calls itself the Republic of China (ROC), celebrating in 2011 the 100th anniversary of its founding. Policy covers three major issue areas: sovereignty over Taiwan; PRC use of force or coercion against Taiwan; and cross-strait dialogue. The United States recognized the ROC until the end of 1978 and has maintained an official, non-diplomatic relationship with Taiwan after recognition of the PRC in 1979. The United States did not explicitly state the sovereign status of Taiwan in the U.S.-PRC Joint Communiques of 1972, 1979, and 1982. The United States "acknowledged" the "one China" position of both sides of the Taiwan Strait.