MOSCOW (Reuters) - Russia's foreign minister on Wednesday endorsed a proposal to allow NATO use of a southern Russian air base as a hub for transport of supplies to Afghanistan and suggested it was premature to withdraw troops from the war-torn country. Sergei Lavrov said the proposal to lease NATO an air base in the Volga River city of Ulyanovsk for non-lethal NATO supply transits to Afghanistan via Central Asia must get formal government approval but is in Russia's "national interest." It would be the first deal allowing U.S. ...