The U.S. special envoy for Iran, Brian Hook, said on Wednesday that Washington now wanted to negotiate a treaty that included Tehran's ballistic missile program and its regional behavior.
Instead, the Iranians are holding talks with European powers, along with Russian Federation and China, aimed at devising mechanisms to circumvent USA financial penalties and thereby salvage the original deal.
Washington remains open to talks with the Iranian leadership to conclude a new Treaty to replace the so-called "nuclear deal", which States came out a few months ago, unilaterally.
"U.S. calls JCPOA (the nuclear deal) a personal agreement between two governments, claiming it seeks a treaty". A treaty would require approval by the Senate.
According to Hook, Iran's supreme leader Ali Khamenei, President Hassan Rouhani and Foreign Minister Mohammed Javad Zarif "have all indicated that they're not interested in talking". "That is insufficient in our system of government if you want to have something enduring and sustainable".
Iran views the United States as acting in bad faith by withdrawing from a deal and has longed blamed Washington for stoking instability in the Middle East.
Iran's top leadership has rejected U.S. offers for talks, including at the annual UN General Assembly starting in NY next week, after Mr Trump withdrew from the deal. "That's their position, we respect that".
According to Hook, the administration is enhancing its diplomatic efforts to make sure Iranian oil sales will be "close to zero" when tougher USA oil sanctions against Tehran are imposed on November 4. To date, Iran has shown little interest in engaging the American administration which in August re-imposed sanctions on Tehran with a second tranche targeting the country's crucial energy and shipping sectors set to take effect in November.
Hook said Iran posed an global threat to peace and security that went beyond the six major powers that sign the initial nuclear deal.
"The threats posed by Iran's support for terrorism are not confined to the Middle East; they are truly global", he said. European and Asian countries have been trying to salvage the nuclear deal despite new US sanctions against Tehran.