High Representative/Vice-President Josep Borrell will visit Iran on 24-25 June, as part of the ongoing efforts to bring the Joint Comprehensive Plan of Action (JCPOA) back to full implementation. 

The High Representative, acting in his capacity as coordinator of the JCPOA, will hold meetings with the Minister of Foreign Affairs, Hossein Amir-Abdollahian, and other relevant Iranian counterparts.

EU and Iran
https://www.eeas.europa.eu/eeas/iran-and-eu-0_en?s=198
 
What is the JCPOA
https://www.eeas.europa.eu/eeas/iran-and-eu-0_en?s=198#8331