now. how close are the forces you're with from pushing isis out entirely? >> reporter: the key thing is they've made swift progress. we thought three or four kilometers on the outskirts of raqqah we were in the the last three weeks or so. that is lighter terrain, sparser buildings. when they hit the old city, we saw them make 400 meters progress in the last few days since a coalition air strike breached the city wall, allowing them to move quickly. now they're hitting urban areas. a mile and a half from east to west. remember, there were two sides of the syrian, kurdish and arab forces coming in different directions of the area. they could meet in the middle. it could be swift if isis do collapse potentially. may happen one day. it could be lengthy. they're in denser streets where there could be more civilians. >> the breaking news tonight is the cease-fire in southwest syria brokered by the u.s. and russia. what kind of impact do you think