. >> joining me now, joel ruben. thank you for joining me.ave they already crossed the red line that the president put out for intervention? should the u.s. intervene, as senator mccain is asking for? >> the situation in syria is something we've never seen before. we have a country collapsing and this country has significant weapons of mass destruction. syria has not signed a chemical weapons convention. they have not, however, moved to use these weapons but they are, according to what we know from the reporting, they are beginning to move these out of storage and the question is, what options do we have and right now the primary option is to ensure that the message is clear to assad and those around him that he cannot use these weapons in any form whatsoever and it seems to have heightened international diplomatic activity, particularly with russia in terms of getting that message out that that's a red line that can't be passed. >> how essential is russia being involved? >> russia is key. russia has been backing assad diplomatically at the u