A senior Iranian official warned on Sunday that the nuclear agreement, from which the United States withdrew unilaterally, would "die forever" if the arms embargo imposed on his country were extended.  

The United States is embarking on a diplomatic campaign to extend the ban on the sale of conventional arms to Iran, which is slated to gradually be lifted from October.    

And the lifting of the embargo is part of the 2015 UN Security Council resolution that approved the nuclear agreement between the superpowers and Tehran to prevent them from acquiring a nuclear weapon.  

On Sunday, Iran's Supreme National Security Council Secretary Ali Shamkhani said on Twitter that the nuclear deal would "die forever" because of "the circumvention of Resolution 2231 and the continued illegal Iranian sanctions." He asked what Iran's partners in the European Union would do with the agreement in such a case.    

"What will the European Union do? Preserve dignity and support pluralism, or accept humiliation and unilateral aid?" He wrote.

The dispute between Iran and the United States has been going on for decades. Tensions rose in 2018 when US President Donald Trump unilaterally announced the US withdrawal from the nuclear deal and reimposed sanctions on Tehran as part of a maximum pressure campaign.

Tehran has gradually backed away from its obligations under the agreement known as the joint comprehensive plan of action in response to Washington's withdrawal from it.    

Other partners in the agreement are Britain, China, France, Germany and Russia.    

The agreement eased international sanctions imposed on the Islamic Republic in exchange for restrictions on its nuclear program.

US Secretary of State Mike Pompeo said last month that he would ask the UN Security Council to extend the ban.    

Washington will use a legal argument based on an explanation of Resolution 2231 that it is still "participating" in the nuclear agreement despite its withdrawal from it, which would enable it to extend the arms embargo imposed on Tehran or impose tougher sanctions.    

Iran accuses the United States of violating the UN resolution on the background of its withdrawal from the agreement in 2018.