National boundaries were not explicitly prescribed by the 1947 Constitution, and the Constitutional Court declined to define these boundaries in a 1993 interpretation, viewing the question as a political question to be resolved by the Executive and Legislative Yuans. The 1947 Constitution included articles regarding representatives from former Qing dynasty territories including Tibet and Mongolia (though it did not specify whether this excluded Outer Mongolia). The ROC recognized Mongolia as an independent country in 1946 after signing the 1945 Sino-Soviet Treaty of Friendship and Alliance, but after retreating to Taiwan in 1949 it reneged on its agreement in order to preserve its claim over China. The Additional Articles of the 1990s did not alter national boundaries, but suspended articles regarding Mongolian and Tibetan representatives. The ROC began to accept the Mongolian passport and removed clauses referring to Outer Mongolia from the Act Governing Relations between the People of the Taiwan Area and the Mainland Area in 2002. In 2012 the Mainland Affairs Council issued a statement clarifying that Outer Mongolia was not part of the ROC's national territory in 1947, and that the termination of the Sino-Soviet Treaty had not altered national territory according to the Constitution. The Mongolian and Tibetan Affairs Commission in the Executive Yuan was abolished in 2017.