Syria: 'For peaceful solution in Syria we need Iran at Gevena-2'

Britain and America's patience with Syrian opposition members seems to be wearing thin. They're threatening to rethink their support, if its main faction decides against attending next week's Geneva peace talks. Another potential player in the region whose participation is in the air is Iran - with Russia and the UN urging Tehran's presence, but Washington sending mixed signals. To discuss this Hillary Mann Leverett, an expert on Iran and US foreign policy, joins RT.