At the same time, the United States grew unwilling to support a foreign intervention against Egypt, which it feared would lead to Soviet intervention. It also was opposed to European colonialism and worried that a Western intervention in Egypt would weaken its authority to condemn the Soviet invasion of Hungary. Israel invaded the Suez in October 1956, and Britain and France (in league with Israel) sent in troops to seize the canal. Using heavy diplomatic and economic pressure, the Eisenhower administration forced Britain and France to withdraw soon. The U.S. delegation to the United Nations voted in favor of United Nations Security Council resolutions condemning the invasion and creating the United Nations Emergency Force. More significantly, the U.S. threatened to sell its bonds and deny emergency IMF assistance for oil shortages, which would caused a devaluation of the pound sterling that would have left Britain unable to import crucial goods. This American pressure led to a temporary warming of Egyptian relations with the United States, although President Dwight D. Eisenhower warned that the United States would consider a closure of the Straits of Tiran to Israeli shipping as an act of war.