If the USA wants negotiations, it should stop pressures and sanctions, Qasemi was quoted as saying by official IRNA news agency.
As part of the withdrawal, the US will on Monday begin to sanction Iranian transactions with USA dollar banknotes; trade in gold and precious metals; direct or indirect sales of graphite, raw or semi-finished metals; and Iran's automotive sector.
The Chinese position comes as the debate over the Iranian deal butts up against tense U.S.
Trump made that much known in a Twitter post days ago during a joint White House news conference with Italian Prime Minister Giuseppe Conte.
Following Trump's decision to quit the historic Iran nuclear pact on May 8, the United States vowed to reimpose sanctions lifted under the accord against Iran and inflict punishments like secondary sanctions on nations that have business links with Iran.
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In Washington, the US State Department tweeted on its Persian-language account: "While it is ultimately up to the #people_of_Iran to determine their country's path, #America supports the voice of the Iranian people, which has been ignored for a long time". Iran and other signatories, including China, have been trying to salvage the deal.
Rouhani's apparent threat earlier in July to disrupt oil shipments from neighboring countries came in reaction to the looming USA sanctions and efforts by Washington to force all countries to stop buying Iranian oil.
Rouhani has suggested Iran might block the Strait of Hormuz in response to a shutdown of its oil exports.
Also last month, China, which is Iran's biggest customer, said it did not accept unilateral sanctions against Iran.
Tehran had offered nearly free shipping and an extended credit period for oil sales to India, its top oil client after China.
When pressed by CNBC to answer the questions she was raising, Croft replied, "I think this market will tighten at the end of this year", and added that Venezuelan production continues to fall and will be a contributing factor.
U.S. crude exports have been seesawing over the past month, falling 51 per cent last week after an 84 per cent increase the week earlier, according to the latest Energy Information Administration Data.
Remaining sanctions ncluding on Iran's oil and gas sector and central bank will resume on November 5.