BBC analysis weighs what US and Iran get from deal and why both could struggle

BBC Middle East analysts write that the US-Iran deal — sold as a victory by Washington and Tehran — carries serious challenges for both sides in its implementation phase. The deal's outlines centre on the formal end of the war, a phased sanctions lifting calendar and a monitoring mechanism. Technical talks on details, however, are still under way.

On the Tehran side, the regime is positioning the gain — which comes with reduced regional reach and domestic economic pressure — as a 'success of the resistance' in the eyes of the public. Because the Revolutionary Guards' weapons inventory has largely been preserved, the deal leaves a manoeuvring space for domestic opponents as well. Washington, for its part, must time sanctions relief in line with congressional support.

BBC analysts judge that the deal could be shaken by even the smallest crisis during implementation. Strait of Hormuz shipping is normalising, but military incidents and missile-launch attempts will be tracked closely. The European Union has reiterated that it will not lift key sanctions until a formal nuclear agreement is in place.