. >> rose: we conclude this evening with an analysis of the agreement with gary seymour, david sanger, ray tacka and gary sick. >> the reason why the iranians are seeking a deal is because the economic pressure of sanctions. and the big question as david said does this taste of sanctions relief make further nuclear concessions more likely or do-- does this modest relief of sanctions make them more able to withstand the status quo and therefore less likely to make nuclear concession. in sex months we'll have a better idea which is correct. >> a analysis of the nuclear agreement with iran. >> funding for charlie rose was provided by the following:. >> rose: and american express. additional funding provided by these funders. and by bloomberg, a provider of multimedia news and information services worldwide. captioning sponsored by rose communications from our studios in new york city, this is charlie rose. >> rose: we begin this evening with a landmark international agreement to halt iran's nuclear program. or at least to freeze it tehran has agreed to a temporary freeze in exchange from