 Complete the following phrase:  In a referendum on 17 March 1991, majorities in nine of the 15 republics voted to preserve the Union. The referendum gave Soviet leader Mikhail Gorbachev a minor boost, and in the summer of 1991, the New Union Treaty was designed and agreed upon by eight republics. The treaty would have turned the Soviet Union into a much looser federation, but its signing was interrupted by the 