**CORRECTS SPELLING OF YELTSIN IN FIRST REFERENCE**FILE** Russian President Boris Yeltsin and his wife Naina wave prior to boarding a helicopter in Washington in this September 29, 1994 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/Shayna Brennan, File)