Explainer

‘Snapback’: What are the sanctions that have been reimposed on Iran?

UN measures, including ban on sales of conventional arms and parts for nuclear program, are now back in effect, but rely on legislation of member states including Russia and China

Illustrative: Iranians walk past shops at the Grand Bazaar in Tehran on September 27, 2025. (ATTA KENARE / AFP)
Illustrative: Iranians walk past shops at the Grand Bazaar in Tehran on September 27, 2025. (ATTA KENARE / AFP)

A raft of UN sanctions on Iran over its nuclear program, lifted under a landmark 2015 deal, went back into force late Saturday.

The sanctions were reimposed because the “E3” European group — Britain, France and Germany — triggered the deal’s so-called “snapback” mechanism, accusing Iran of failing to meet its obligations under the deal.

While Iran publicly denies seeking nuclear weapons, it has enriched uranium to levels that have no peaceful application, obstructed international inspectors from checking its nuclear facilities, and expanded its ballistic missile capabilities.

Israel has said it struck Iran on June 13, launching a 12-day war, after the Islamic Republic, which is sworn to destroy Israel, took steps toward imminent weaponization.

Here are some key facts about the “snapback” process:

What do the sanctions target?

The sanctions target companies, organizations and individuals that contribute directly or indirectly to Iran’s nuclear program or the development of its ballistic missiles.

Providing necessary equipment, expertise, or funding are all grounds for sanctions.

Swath of the economy affected

The sanctions include an embargo on conventional weapons with the prohibition of any sale or transfer of arms to Iran.

Imports, exports or transfers of parts and technologies related to the nuclear and ballistic program will be prohibited.

A man rides his motorcycle past a deactivated Kheibar Shekan ballistic missile in front of a picture of Iran’s Supreme Leader Ayatollah Ali Khamenei in Tehran’s Bahrestan Square on September 27, 2025. (ATTA KENARE / AFP)

The assets of entities and individuals abroad belonging to Iranian persons or groups linked to the nuclear program will be frozen.

Individuals designated as participating in prohibited nuclear activities may be banned from traveling to UN member states.

UN member states will be required to restrict access to banking and financial facilities that could help Iran’s nuclear or ballistic programs.

Anyone violating the sanctions regime could see their assets frozen worldwide.

The EU had its own sanctions

Separate measures by the European Union could now be reimposed alongside the core, global sanctions.

Their goal was to hit the Iranian economy, not only to hamper nuclear activity but also to inflict fiscal pain to force Tehran to comply.

Tankers are seen at the Khor Fakkan Container Terminal, the only natural deep-sea port in the region and one of the major container ports in the Sharjah Emirate, along the Strait of Hormuz, a waterway through which one-fifth of global oil output passes, on June 23, 2025. (Giuseppe CACACE / AFP)

The United States already imposes its own sanctions, including ones to prohibit other countries from buying Iranian oil, after US President Donald Trump withdrew from the nuclear deal in his first term.

How does ‘snapback’ take effect?

The “snapback” process reactivates UN resolutions, but their practical implementation requires UN member states to update their laws to comply.

It will be up to the EU and Britain to pass legislation so that the sanctions can be enforced, but neither has given details on that process.

How are sanctions enforced?

The UN Security Council resolutions and the associated sanctions are binding — but are regularly violated.

The big question is whether countries like China and Russia, which consider the triggering of the “snapback” illegal, might decide not to comply.

The United Nations Security Council holds a meeting on Iran at UN headquarters on September 19, 2025, in New York. (ANGELA WEISS / AFP)

Some countries, including China, continued to trade with Iran despite the presence of US sanctions.

The European powers expect Russia will not comply with the sanctions but are unclear about how China, which imports a significant amount of oil from Iran, might react.

“There is a cost to circumventing sanctions, a political cost, but also a financial and economic cost because financial transactions become more expensive,” said Clement Therme, an associate researcher at the International Institute for Iranian Studies linked to Sorbonne University.

Shipping companies are one example of businesses that will feel the pinch.

“In the case of UN sanctions, we probably won’t see a full blockade, but rising costs instead,” Therme added.

Most Popular
read more:
If you’d like to comment, join
The Times of Israel Community.
Join The Times of Israel Community
Commenting is available for paying members of The Times of Israel Community only. Please join our Community to comment and enjoy other Community benefits.
Please use the following structure: example@domain.com
Confirm Mail
Thank you! Now check your email
You are now a member of The Times of Israel Community! We sent you an email with a login link to . Once you're set up, you can start enjoying Community benefits and commenting.