**FILE** Soviet reformer Boris Yeltsin is shown as he addresses the a rally of supporters at Moscow's Pushkin Square in this May 29, 1989 file photo. Former President Boris Yeltsin, who engineered the final collapse of the Soviet Union and pushed Russia to embrace democracy and a market economy, has died, a Kremlin official said Monday, April 23, 2007. He was 76. (AP Photo/Boris Yurchenko, File)