The US is about to re-impose sanctions on Iran under the automatic resumption of sanctions on the grounds that Tehrran does not comply with the nuclear agreement.

US Secretary of State Mike Pompeo sent a letter to the chairman of the United Nations Security Council on August 20, accusing Iran of "not complying with a substantial" provisions of the Comprehensive Joint Plan of Action (JCPOA).

This marked the beginning of a snapback in the JCPOA, which was opposed by America's European allies.

Pompeo criticized the European allies' statements, saying they had "chosen sides with Iran's leadership".

The move was made just a week after the United Nations Security Council rejected a proposed US draft to extend the ban on arms sales to Iran, which expired in October.

JCPOA was signed by Iran with 6 powers including the US, UK, France, Germany, Russia, and China in 2015 after 15 years of diplomatic negotiations.

US President Donald Trump in 2018 announced his withdrawal from the agreement because it was "ineffective", and carried out a campaign of maximum pressure on Iran by imposing multiple sanctions on this country, despite the objections.

Since the US pulled out of the JCPOA in 2018, Iran has repeatedly broken its commitment in the agreement in response.