The following , was engulfed by Cold War history and the American foreign policy of containment in East Asia after the Korean War. Before the Korean War broke out, the US was preparing for a coup d'état in mid-1950 to replace Chiang Kai-shek with Hu Shih and Sun Li-jen and neutralize the ROC's legal status under UN Trusteeship to block any legal claim of the PRC on Taiwan, as proposed by United States Department of State official Dean Rusk. The Formosa Resolution of 1955 was passed unanimously by the United States Congress. Resolving the cross-Strait relationship required both sides to rethink definitions of basic concepts such as sovereignty, "one China" and unification. The two polities of accession resulted in the PRC's Campaign to Suppress Counterrevolutionaries, the lifting of its martial law on PRC territory, and more recently the enactment of the PRC's Anti-Secession Law towards the ROC. The two sides have no cross-strait military confidence-building measures (CBM) "to improve military-to-military relations in ways that reduce fears of attack and the potential for military miscalculation". Nuclear tensions have risen since the PRC promulgated the Anti-Secession Law. Neither Taipei nor Beijing sees their relations as foreign relations. However, the government position that both Taiwan and mainland China are parts of the same state is not universally accepted among the people of Taiwan. In particular, the pro-independence Pan-Green Coalition considers Taiwan and China to be different countries. By contrast, the pro-unification Pan-Blue Coalition take the view that both Taiwan and mainland China are parts of the ROC. Former president Lee Tung-hui described these relations as "Special state-to-state relations". The Chen administrations described Taiwan and China by saying "...with Taiwan and China on each side of the Taiwan Strait, each side is a country.". Former President Ma Ying-jeou returned to the government position of the early 1990s, calling relations with Beijing special relations between two areas within one state. That state, according to Taiwan is the ROC, and due to constitutional reasons, neither Taipei nor Beijing recognises each other as a legitimate government. The term preferred by Taiwanese and Chinese governments is "cross-strait relations", referring to the geographical separator, the Taiwan Strait. The constitutional position of Taipei is that the territory of the ROC is divided into the "Mainland Area" and the "Free Area" (also known as "Taiwan Area"). Administratively, cross-strait relations are not conducted by the Ministry of Foreign Affairs of Taiwan, but