In a tweet on Saturday, Majid Takht-Ravanchi said the US ambassador to the UN "wrongly" believes the US retains the right to initiate snapback of sanctions under the UN Security Council Resolution 2231.
"WRONG: US cannot be a JCPOA 'Participant', since Donald Trump ceased US participation," the Iranian ambassador said, referring to Trump's 2018 decision to withdraw his country from the Iran nuclear deal, formally known as the Joint Comprehensive Plan of Action, in violation of Resolution 2231, IRNA reported.
"The US—which is in violation of the resolution—has no right to initiate anything under Resolution 2231," he added.
Under the resolution, the arms embargo on Iran will be lifted in October 2020, but the US says it will use a range of options to prevent this and use a Security Council provision to block the ban’s expiration.
While the US is no longer a party to JCPOA, it recently launched a campaign to renew the Iran arms ban, in place since 2006-07, through a resolution at the UN Security Council, which Russia and China are most likely to veto.
On Friday, US Ambassador to the UN Kelly Craft announced that Washington had shared the draft resolution on the extension of Iran's arms embargo with Russia, Britain, France, Germany and Estonia—all members of the Security Council.
"Pretty soon we'll be sharing [with] the full 15. But, you know, we are trying to really work very carefully, very thoroughly," she told reporters.
Craft urged Moscow and Beijing to join what she claimed "a global consensus on Iran's conduct".
"This is an absolute imperative that we exercise all of our options to make certain that this UN arms embargo is extended," she added.
Russia and China, both veto-wielding permanent UN Security Council members, have already declared their opposition to the US plan.