US Secretary of State John Kerry, left, speaks to the media as he meets with Iranian Foreign Minister Mohammad Javad Zarif Friday, April 22, 2016, in New York.

Iran asked UN chief Ban Ki-moon on Thursday to convince the United States to stop violating state immunity after the top US court ruled that $2 billion in frozen Iranian assets must be paid to American victims of attacks blamed on Tehran.

Iran’s Foreign Minister Mohammad Javad Zarif wrote to Ban a week after the US Supreme Court ruling, calling on the Secretary-General to use his “good offices in order to induce the US Government to adhere to its international obligations.”

Zarif’s appeal comes amid increasing Iranian frustration at what they say is the failure of the United States to keep its promises regarding sanctions relief agreed under an historic nuclear deal struck last year by Tehran and six world powers.

In the letter, released by the Iranian UN mission, Zarif asked Ban to help secure the release of frozen Iranian assets in US banks and persuade Washington to stop interfering with Iran’s international commercial and financial transactions.

“The US Executive branch illegally freezes Iranian national assets; the US Legislative branch legislates to pave the ground for their illicit seizures; and the US Judicial branch issues rulings to confiscate Iranian assets without any base in law or fact,” Zarif said.

Supreme Leader Ayatollah Ali Khamenei’s top adviser Ali Akbar Velayati was quoted by Iranian state media as saying that “Iran will never abandon its right and will take any necessary action to stop such an international theft.”

“This money belongs to Iran,” he said.

Ban’s spokesman and the US mission to the United Nations did not immediately respond to requests for comment on the letter or the accusations made against the United States.

Zarif told Ban he wanted to “alert you and through you the UN general membership about the catastrophic implications of the US blatant disrespect for state immunity, which will cause systematic erosion of this fundamental principle.”

The US Supreme Court found that the US Congress did not usurp the authority of American courts by passing a 2012 law stating that Iran’s frozen funds should go toward satisfying a $2.65 billion judgment won by the US families against Iran in US federal court in 2007.

“It is in fact the United States that must pay long overdue reparations to the Iranian people for its persistent hostile policies,” Zarif wrote, citing incidents including the shooting of an Iranian civil airliner in 1988.

Last week Zarif met several times with US Secretary of State John Kerry in New York to discuss Iranian problems accessing international financial markets.

Tehran has called on the United States to do more to remove obstacles to the banking sector so that businesses feel comfortable investing in Iran without fear of penalties.

Some hardline lawmakers have called on the government of President Hassan Rowhani to consider the ruling a violation of the nuclear deal reached with the United States and other major powers in 2015.

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