The Times of Israel reports: Amid growing Iranian complaints that world powers have failed to live up to their obligations under the nuclear accord with Tehran, Supreme Leader Ayatollah Ali Khamenei said Monday that dialogue with the US had proven to be “a lethal poison,” as Washington had shown that it could not be trusted.

“They want us to negotiate with them on the regional issues but the nuclear deal experience tells us that this is a lethal poison,” he said in a speech in Tehran.

“The Americans want to take everything in return for nothing,” the Fars news agency quoted the leader as saying. “Negotiations with such a government mean diversion from the correct path of the country’s progress, making repeated concessions and bearing their bullying, violations and disloyalty in practice.”

Khamenei said that six months after the implementation of the deal, it had not prompted any tangible change in Iranians’ lives.

The deal reached on July 14, 2015 saw the US, Britain, China, France, Germany and Russia agree to lift some international sanctions in exchange for guarantees that Iran would not pursue nuclear weapons.

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