GM, the world's biggest automaker, is on the verge of announcing its largest 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. By mid-October, the US manufacturer is expected to decide whether to approve the deal, which would be based at AvtoVAZ's headquarters in Togliatti, nearly 1,000 kilometers southeast of Moscow.