Afghanistan has been called the 'graveyard of empires' - a land that has never been conquered by a foreign force.<br /><br />Russia's red army spent a decade there and returned to the Soviet Union broken and defeated.<br /><br />As the US sends more troops to Afghanistan, it could learn from the former Soviet Union's experience there.<br /><br />Al Jazeera's Neave Barker reports from Moscow on the lessons to be learned.
