Iran’s Foreign Minister Mohammad Javad Zarif has called on the new US administration to lift all sanctions imposed by former president Donald Trump in reaction to the White House retreat from the snapback mechanism.

Mohammad Javad Zarif reacted to the US decision to withdraw from activating the snapback mechanism and the return of UN sanctions against Iran.

"US acknowledged Pompeo's claims re Res. 2231 had no legal validity. We agree," he wrote in a tweet on Friday.

"In compliance w/ 2231: US unconditionally & effectively lift all sanctions imposed, re-imposed or re-labeled by Trump," he added.

"We will then immediately reverse all remedial measures," he stressed.

The United States on Thursday told the United Nations Security Council it was rescinding a Trump administration assertion that all UN sanctions had been reimposed on Iran in September.

Acting US Ambassador Richard Mills informed the 15-member body in a letter seen by Reuters.

US Secretary of State Antony Blinken told European allies on Thursday that President Joe Biden’s administration was prepared to talk to Iran about both countries returning to a 2015 deal.

The Trump administration quit the pact in 2018. Then in August last year former Secretary of State Mike Pompeo said he had triggered a 30-day process at the Security Council that led to the return of UN sanctions on Iran and stopped a conventional arms embargo on Tehran from expiring on Oct. 18.

13 of the 15 Security Council members said Washington’s move was void because Pompeo used a mechanism agreed under the 2015 nuclear deal that the Trump administration had abandoned.

The Islamic Republic of Iran has emphasized that for Tehran, the return of the United States to the JCPOA is not an important issue, but what is important is the lifting of US sanctions against Iran.