Iran said on Wednesday it had tested the new ballistic missile but said it did not breach a nuclear deal reached with six major powers in 2015.

A top adviser to Supreme Leader Ayatollah Ali Khamenei said on Thursday Iran will not yield to “useless” US threats from “an inexperienced person” over its ballistic missile program.

US President Donald Trump’s national security adviser, Michael Flynn, said on Wednesday the United States was putting Iran on notice over its “destabilizing activity” after it test-fired a ballistic missile.

Trump echoed that language on Thursday, saying in a tweet “Iran has been put formally put on notice” after his administration said it was reviewing how to respond to the launch that Iran said was solely for defensive purposes.

Iran said on Wednesday it had tested the new ballistic missile but said it did not breach a nuclear deal reached with six major powers in 2015 or a UN Security Council resolution that endorsed the accord.

“This is not the first time that an inexperienced person has threatened Iran … the American government will understand that threatening Iran is useless,” Ali Akbar Velayati said, without identifying any US official specifically in his comments.

“Iran does not need permission from any country to defend itself,” he was quoted as saying by the semi-official Fars news agency. Khamenei is the country’s most powerful figure.

A US official said Iran had test-launched the medium-range ballistic missile on Sunday and it exploded after traveling 630 miles (1,010 km). Iran said it had been a successful launch.

A series of tests conducted by Iran’s elite Revolutionary Guards Corps (IRGC) in 2016 caused international concern, with some powers saying any launch of nuclear-capable ballistic missiles would violate UN Security Council resolution 2231.

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