Speaking in his weekly press conference on Monday, Seyyed Abbas Mousavi said, Tehran will attend the summit of the Non-Aligned Movement”.

Iran will begin the third phase of reduction of its commitments under the 2015 nuclear deal after the end of the second 60-day deadline. We will go forward for the third phase stronger and more decisive if the other signatures of Iran nuclear deal don’t fulfill their commitments and stay limited to empty words,” he added.

Mousavi said Iran is still open to negotiations with its European partners, expressing the hope they would take steps forward toward implementing their commitments.

The spokesman announced that the next meeting of the Joint Commission of the Joint Comprehensive Plan of Action (JCPOA) will be held late July and the exact date and place of it will be subsequently announced.

About the fate of the two Iranian tankers, the spokesman said, "The tanker which is in Saudi Arabia had asked for help because of a technical defect."

Iran's Foreign Ministry is following the case. The political, diplomatic and legal efforts on the other supertanker that was carrying Iran's crude and seized by UK in Gibraltar are also underway,” he said.

We have summoned British ambassador twice. We have discussed the issue with some other European diplomats, and all the required documents by have been presented to those who are following the case.”

"We urge the UK government to release the tanker as we cannot accept the piracy that will only add to the tensions," he said.