General Motors Corp, the world's largest automaker, is on the verge of announcing its biggest project in Eastern Europe: a complex and innovative venture of $500 million-$600 million to build cars in Russia with AO AvtoVAZ, producer of Lada vehicles. Strikingly, plans call for production of a Russian-designed model that likely would don GM's Chevrolet badge - a $7,500 all-wheel-drive off-roader that would be exported widely as the cheapest sports-utility vehicle in the world.