Volkswagen AG's CEO Winterkorn smiles during annual news conference in Wolfsburg
Volkswagen AG's CEO Martin Winterkorn smiles during the annual news conference in Wolfsburg March 10, 2011. German carmaker Volkswagen warned that tax and legal hurdles posed a sizeable obstacle to a merger deal with Porsche but said it would not turn its back on its indebted ally.
REUTERS/Christian Charisius (GERMANY - Tags: TRANSPORT BUSINESS)