The objective of the current research is to analyze the literature produced within the Islamic Consultative Assembly regarding nuclear diplomacy. In this regard, interviews have been conducted with representatives from various political spectrums of the parliament concerning their approaches and perspectives towards the country's nuclear dossier from the beginning until now, the parliament's programs, and specifically the plan of the Proportionate and Reciprocal Measure of the Islamic Republic of Iran in the implementation of the JCPOA. This research is descriptive-explanatory in terms of objective and fundamental in terms of audience analysis. A qualitative research strategy has been utilized in this research. Regarding whether the JCPOA has yielded any benefit for the negotiating parties or not, it was demonstrated that none of the parties achieved what they desired. The seven-month prolongation of the unequal war between Israel and the Ḥamās group, which can be considered a defeat for Israel, has entirely been due to the enhancement of Iran's military, political, and security capabilities during this period, in which the Islamic Consultative Assembly has possessed a significant role through its ratification and supervision.