evidence: The scope of the territorial and maritime disputes in the South China Sea was clarified in the 2016 SCS Arbitration between the Philippines and China. According to the Arbitral Tribunal, the Spratly Islands consist of low-tide elevations not susceptible to appropriation and high-tide elevations that are not islands but rocks and entitled only to a 12-nautical-mile territorial sea. China, Malaysia, Philippines, Taiwan, and Vietnam claim these rocks, but none may treat the rocks as an offshore archipelago. [...] Nonetheless, in 1978, the Philippines formally claimed the Spratly Islands as an offshore archipelago arguing that "while other states have laid claims to some of these areas, their claims have lapsed by abandonment and cannot prevail over that of the Philippines on legal, historical, and equitable grounds." Still, then-U.S. Secretary of State Cyrus Vance did not declare the MDT applicable to the disputed Spratly Islands. Rather, Document 578 of American Foreign Policy Basic Documents 1977-1980 is a 1979 letter to then-Philippine Minister of Foreign Affairs Carlos Romulo, in which Vance further clarified the U.S. legal interpretation of the MDT. He declared that armed attack under the MDT refers to external armed aggression against any part of Philippine metropolitan territory as defined by the 1898 Treaty of Paris between Spain and the U.S. and the 1900 Treaty of Washington between Great Britain and the U.S. (amended in 1930), as well as island territories in the Pacific that are under Philippine jurisdiction.