Iran and the European Union plan to hold the third seminar on peaceful nuclear cooperation and the fourth round of high-level political talks in Brussels, Iranian Deputy Foreign Minister for Political Affairs Abbas Araqchi says, Press TV reports.

In a post on his Twitter account on Sunday, Araqchi said the two "important events" in relations between Iran and the EU would take place at a time that the United States has imposed toughest sanctions against Tehran.

He noted that chief of the Atomic Energy Organization of Iran (AEOI) Ali Akbar Salehi would attend the third seminar on peaceful nuclear cooperation in the Belgian capital.

The senior diplomat said the fourth round of high-level political talks would be chaired by Secretary General of the European External Action Service (EEAS) Helga Schmid and him.

Earlier on Sunday, the AEOI chief left Tehran for Brussels to participate in the two-day seminar, due to kick off on Monday.

The two events will come for the first time since President Donald Trump unilaterally withdrew the U.S. in May from the Iran nuclear deal, officially known as the Joint Comprehensive Plan of Action (JCPOA), and decided to reimpose unilateral sanctions against Tehran.