Implementation of the interim deal with Iran, which freezes the country’s nuclear enrichment in exchange for limited sanctions relief, began in January. As a result, we are witnessing a substantial shift in diplomatic relations between Iran and its regional neighbours – some positive, some not. This deal marks a significant step for the international non-proliferation regime, but will it achieve the trust and confidence-building goals intended? As the US and Iran face increasing domestic pushback on the terms of the agreement, questions remain on the interim deal’s impact on relations in the region and abroad, and the effect these relations may have on the prospects of coming to a full comprehensive follow-up agreement between Iran and the P5+1 countries.