In August 1990, Iraq invaded Kuwait, triggering the Gulf War between Iraq and a large allied force, led by the United States. Iraq attacked Israel with 39 Scud missiles. Israel did not retaliate at request of the US, fearing that if Israel responded against Iraq, other Arab nations might desert the allied coalition. Israel provided gas masks for both the Palestinian population and Israeli citizens, while Netherlands and the United States deployed Patriot defence batteries in Israel as protection against the Scuds. In May 1991, during a 36-hour period, 15,000 Beta Israel (Ethiopian Jews) were secretly airlifted to Israel. The coalition's victory in the Gulf War opened new possibilities for regional peace, and in October 1991 the US president, George H.W. Bush, and Soviet Union Premier, Mikhail Gorbachev, jointly convened a historic meeting in Madrid of Israeli, Lebanese, Jordanian, Syrian, and Palestinian leaders. Shamir opposed the idea but agreed in return for loan guarantees to help with absorption of immigrants from the former Soviet Union. His participation in the conference led to the collapse of his (right-wing) coalition.