The United States slapped additional sanctions on Iran on Monday after the Trump administration's unilateral weekend declaration that all United Nations penalties that were eased under the 2015 nuclear deal had been restored.

The announcement comes in defiance of the world community, which has rejected U..S. legal standing to impose the international sanctions and sets the stage for an ugly showdown at the annual U.N. General Assembly this week.

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Treasury Secretary Steve Mnuchin, third from left, steps back after speaking as Defense Secretary Mark Esper, second from right, prepares to speak at a news conference to announce the Trump administration's restoration of sanctions on Iran, Monday, Sept. 21, 2020, at the U.S. State Department in Washington. Also pictured are from left, National Security Adviser Robert O'Brien, Commerce Secretary Wilbur Ross, Mnuchin, Secretary of State Mike Pompeo, Esper and U.S. Ambassador to the United Nations Kelly Craft. (AP PhotoPatrick Semansky)

The United States slapped additional sanctions on Iran on Monday after the Trump administration's unilateral weekend declaration that all United Nations penalties that were eased under the 2015 nuclear deal had been restored.

Head of the Atomic Energy Organization of Iran Ali Akbar Salehi sits in a press briefing with Director General of International Atomic Energy Agency, IAEA, Rafael Mariano Grossi in Tehran, Iran, Tuesday, Aug. 25, 2020. Salehi said his country won’t accept any additional demands beyond its commitments under the 2015 nuclear deal. The statement on Tuesday came as the chief of the U.N. nuclear watchdog was visiting Iran. (Atomic Energy Organization of Iran via AP)

Speaking to reporters with fellow Cabinet secretaries at the State Department, Secretary of State Mike Pompeo then announced the administration was hitting more than two dozen Iranian individuals and institutions with penalties. Nearly all of them, however, including the Iranian defense ministry and its atomic energy agency, were already subject to U.S. sanctions that the administration had re-imposed after Trump withdrew from the nuclear deal in 2018.

People sit at desks keeping social distance during the general conference of the IAEA, in Vienna, Austria, Monday, Sept. 21, 2020. (AP PhotoRonald Zak)

“No matter where you are in the world, you will risk sanctions,” he said, warning foreign companies and officials not to do business with targeted Iranian entities.

A cleric and his friends wearing protective face masks to help prevent the spread of the coronavirus cross an intersection in downtown Tehran, Iran, Sunday, Sept. 20, 2020. Iran's president dismissed U.S. efforts to restore all U.N. sanctions on the country as mounting economic pressure from Washington pushed the local currency down to its lowest level ever on Sunday. (AP PhotoVahid Salemi)

But few U.N. member states believe the U.S. has the legal standing to restore the sanctions because Trump withdrew from the nuclear deal in 2018. The U.S. argues it retains the right to do so as an original participant in the deal and a member of the council.

Director General of International Atomic Energy Agency, IAEA, Rafael Mariano Grossi, top second right, attends a meeting with head of the Atomic Energy Organization of Iran Ali Akbar Salehi, bottom left, in Tehran, Iran, Tuesday, Aug. 25, 2020. Others are unidentified. (Atomic Energy Organization of Iran via AP)

At a conference of the International Atomic Energy Agency in Vienna, Salehi said the Joint Comprehensive Plan of Action, or JCPOA, has been “caught in a quasi-stalemate situation” since Trump pulled out.

“The United States has now restored U.N. sanctions on Iran,” President Donald Trump said in a statement issued shortly after he signed an executive order spelling out how the U.S. will enforce the “snapback” of the sanctions. “My actions today send a clear message to the Iranian regime and those in the international community who refuse to stand up to Iran.”

Treasury Secretary Steve Mnuchin, third from left, steps back after speaking as Defense Secretary Mark Esper, second from right, prepares to speak at a news conference to announce the Trump administration's restoration of sanctions on Iran, Monday, Sept. 21, 2020, at the U.S. State Department in Washington. Also pictured are from left, National Security Adviser Robert O'Brien, Commerce Secretary Wilbur Ross, Mnuchin, Secretary of State Mike Pompeo, Esper and U.S. Ambassador to the United Nations Kelly Craft. (AP PhotoPatrick Semansky)

Treasury Secretary Steve Mnuchin, third from left, steps back after speaking as Defense Secretary Mark Esper, second from right, prepares to speak at a news conference to announce the Trump administration's restoration of sanctions on Iran, Monday, Sept. 21, 2020, at the U.S. State Department in Washington. Also pictured are from left, National Security Adviser Robert O'Brien, Commerce Secretary Wilbur Ross, Mnuchin, Secretary of State Mike Pompeo, Esper and U.S. Ambassador to the United Nations Kelly Craft. (AP PhotoPatrick Semansky)

Speaking to reporters with fellow Cabinet secretaries at the State Department, Secretary of State Mike Pompeo then announced the administration was hitting more than two dozen Iranian individuals and institutions with penalties. Nearly all of them, however, including the Iranian defense ministry and its atomic energy agency, were already subject to U.S. sanctions that the administration had re-imposed after Trump withdrew from the nuclear deal in 2018.

Trump's executive order mainly affects Iranian and foreign entities involved in conventional weapons and ballistic missile activity. A U.N. arms embargo on Iran is to expire in October under the terms of the nuclear deal, but Pompeo and others insist the snapback has rescinded its termination.

Accompanied by Treasury Secretary Stephen Mnuchin, Defense Secretary Mark Esper, Commerce Secretary Wilbur Ross, Ambassador to the United Nations Kelly Craft and national security adviser Robert O'Brien, Pompeo said the U.S. was acting because the rest of the world is refusing to confront the Iranian threat.

Head of the Atomic Energy Organization of Iran Ali Akbar Salehi sits in a press briefing with Director General of International Atomic Energy Agency, IAEA, Rafael Mariano Grossi in Tehran, Iran, Tuesday, Aug. 25, 2020. Salehi said his country won’t accept any additional demands beyond its commitments under the 2015 nuclear deal. The statement on Tuesday came as the chief of the U.N. nuclear watchdog was visiting Iran. (Atomic Energy Organization of Iran via AP)

Head of the Atomic Energy Organization of Iran Ali Akbar Salehi sits in a press briefing with Director General of International Atomic Energy Agency, IAEA, Rafael Mariano Grossi in Tehran, Iran, Tuesday, Aug. 25, 2020. Salehi said his country won’t accept any additional demands beyond its commitments under the 2015 nuclear deal. The statement on Tuesday came as the chief of the U.N. nuclear watchdog was visiting Iran. (Atomic Energy Organization of Iran via AP)

“No matter where you are in the world, you will risk sanctions,” he said, warning foreign companies and officials not to do business with targeted Iranian entities.

Craft said, “As we have in the past, we will stand alone to protect peace and security."

The administration declared on Saturday that all U.N. sanctions against Iran had been restored because Tehran is violating parts of the nuclear deal in which it agreed to curb its nuclear program in exchange for billions of dollars in sanctions relief.

People sit at desks keeping social distance during the general conference of the IAEA, in Vienna, Austria, Monday, Sept. 21, 2020. (AP PhotoRonald Zak)

People sit at desks keeping social distance during the general conference of the IAEA, in Vienna, Austria, Monday, Sept. 21, 2020. (AP PhotoRonald Zak)

But few U.N. member states believe the U.S. has the legal standing to restore the sanctions because Trump withdrew from the nuclear deal in 2018. The U.S. argues it retains the right to do so as an original participant in the deal and a member of the council.

The remaining world powers in the deal — France, Germany, Britain, China and Russia — have been struggling to offset the sanctions that the U.S. re-imposed on Iran after the Trump administration left the pact, which the president said was one-sided in favor of Tehran.

Ali Akbar Salehi, the head of Iran’s nuclear agency, said Monday that there is still a broad agreement among the international community that the nuclear pact should be preserved.

A cleric and his friends wearing protective face masks to help prevent the spread of the coronavirus cross an intersection in downtown Tehran, Iran, Sunday, Sept. 20, 2020. Iran's president dismissed U.S. efforts to restore all U.N. sanctions on the country as mounting economic pressure from Washington pushed the local currency down to its lowest level ever on Sunday. (AP PhotoVahid Salemi)

A cleric and his friends wearing protective face masks to help prevent the spread of the coronavirus cross an intersection in downtown Tehran, Iran, Sunday, Sept. 20, 2020. Iran's president dismissed U.S. efforts to restore all U.N. sanctions on the country as mounting economic pressure from Washington pushed the local currency down to its lowest level ever on Sunday. (AP PhotoVahid Salemi)

At a conference of the International Atomic Energy Agency in Vienna, Salehi said the Joint Comprehensive Plan of Action, or JCPOA, has been “caught in a quasi-stalemate situation” since Trump pulled out.

While insisting it is not pursuing a nuclear weapon, Iran has been steadily breaking restrictions outlined in the deal on the amount of uranium it can enrich, the purity it can enrich it to, and other limitations. At the same time, Iran has far less enriched uranium and lower-purity uranium than it had before signing the deal, and it has continued to allow international inspectors into its nuclear facilities.

Director General of International Atomic Energy Agency, IAEA, Rafael Mariano Grossi, top second right, attends a meeting with head of the Atomic Energy Organization of Iran Ali Akbar Salehi, bottom left, in Tehran, Iran, Tuesday, Aug. 25, 2020. Others are unidentified. (Atomic Energy Organization of Iran via AP)

Director General of International Atomic Energy Agency, IAEA, Rafael Mariano Grossi, top second right, attends a meeting with head of the Atomic Energy Organization of Iran Ali Akbar Salehi, bottom left, in Tehran, Iran, Tuesday, Aug. 25, 2020. Others are unidentified. (Atomic Energy Organization of Iran via AP)