YALTA, Ukraine -- Leaders of former Soviet republics endorsed an ambitious plan Friday aimed at recreating the economic union that collapsed with the breakup of the Soviet Union, a move they stressed was a not a bid to turn back the clock but to pump up the region's sagging economic might. The Commonwealth of Independent States, a loose grouping of 12 former Soviet republics, agreed to move toward the eventual creation of a free trade zone stretching from Central Asia to the edge of the European Union. Leading the march were Russia and three of its neighbors, who signed a...