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Iran’s president is striking a muscular tone on dealings with the U.S., saying that “talks are useless” as Tehran’s nuclear deal with world powers crumbles further.

President Hassan Rouhani made the comment in a speech on Thursday in Tehran during the unveiling of the Bavar-373, a long-range surface-to-air missile system that he described as an improvement to the Russian S-300.

Rouhani said that “now that our enemies do not accept logic, we cannot respond with logic.”

WATCH: Iran says meeting on 2015 nuclear deal was ‘constructive’

4:02 Iran says meeting on 2015 nuclear deal was ‘constructive’ Iran says meeting on 2015 nuclear deal was ‘constructive’

He added: “When the enemy launches a missile against us, we cannot give a speech and say: ‘Mr. Rocket, please do not hit our country and our innocent people. Rocket-launching sir, if you can please hit a button and self-destroy the missile in the air.'”

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Iran has developed a homegrown defence industry since 1992.