Iranian President Hassan Rohani demanded on Wednesday that the United States "pay more" for any agreement that goes beyond the 2015 Iran nuclear deal that Washington abandoned.
Rohani also rejected meeting U.S. President Donald Trump while the two are in New York this week for the annual United Nations General Assembly, and warned world leaders that the Gulf region was on the verge of going up in flames.
"Our response to talks under pressure is 'No,'" Rohani said in a speech to the General Assembly even as the United States increased the pressure by sanctioning Chinese firms for dealing in Iranian oil despite U.S. sanctions.
The U.S.-Iranian confrontation has ratcheted up since last year, when Trump withdrew from Iran's nuclear deal with major powers and reimposed sanctions that have crippled the Islamic republic's economy.
Trump wants to go beyond that deal to further curb Iran's nuclear program, halt its ballistic missile work and end its support for proxy forces in the Middle East.
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"If you wish more, if you require more, you should give and pay more," Rohani said in his General Assembly address, without giving details.
In his own speech on Tuesday, Trump accused Iranian leaders of "bloodlust" and called on other nations to put pressure on Iran after Sept. 14 attacks on Saudi oil facilities that Washington blames on Tehran despite its denials.
The United States plans to increase its military presence in Saudi Arabia following the attacks.
Rohani, however, said the Gulf region is "on the edge of collapse, as a single blunder can fuel a big fire."
"We shall respond decisively and strongly to any sort of transgression to and violation of our security and territorial integrity," Rohani said in his speech.
Trump had said there was still a path to peace and Rohani has also left the door open to diplomacy, saying that if sanctions were lifted, Washington could join nuclear talks between Tehran and other powers.
The United States has been reaching out to Iranian officials to discuss the fate of American nationals held in Iran, a U.S. State Department official said on Wednesday.
No Trump-Rohani meeting seen
Despite French and British leaders urging Rohani to meet Trump, an Iranian official told Reuters there was no chance the U.S. and Iranian presidents would meet this week.
"The chances of a meeting are zero. They know what to do. They should return to the JCPOA, lift sanctions and end this unfair maximum pressure on Iran," the official said, referring to the 2015 nuclear deal, known formally as the Joint Comprehensive Plan of Action, or JCPOA.
"Then, of course, they can join the talks under the deal," added the official, who spoke to Reuters on condition of anonymity.
Under the 2015 deal, Iran limited its nuclear program in return for relief from economic sanctions that constricted its ability to trade with the world.
After abandoning the deal, Trump in May tightened sanctions on Iran in an effort to reduce its oil exports - its main source of foreign exchange and government revenues - to zero.
On Wednesday, the United States sanctioned five Chinese people and six entities it accused of knowingly transferring oil from Iran in violation of Washington's curbs on Tehran. The entities include two Cosco Shipping subsidiaries but not the parent company itself.
While it at first fully adhered to the deal despite Trump's withdrawal, Iran has gradually reduced its compliance and has threatened to block the Strait of Hormuz in the Gulf, through which an estimated one-fifth of the world's oil passes.
The United States has blamed Iran for a series of actions since May - some of which Iran has denied - that have roiled oil markets, including attacks on half a dozen tankers, shooting down a U.S. drone and the Sept. 14 attacks on Aramco facilities.
The air strikes on the heartland of Saudi Arabia's oil industry damaged the world's biggest petroleum-processing facility and knocked out more than 5% of global oil supply.
"This cannot go unanswered, there has to be consequences for Iran for what they did," Saudi Minister of State for Foreign Affairs Adel al-Jubeir said, saying Riyadh was consulting others and that the range of options includes diplomatic and economic ones.
The United States, European powers and Saudi Arabia have blamed the attack on Iran, instead of the Yemeni Iran-aligned Houthi group, which claimed responsibility. Iran distanced itself from the attacks but said it was ready for "full-fledged" war.
The confrontation could favor hard-liners in Iran seeking to limit Rohani's ability to open up to the West, particularly because Supreme Leader Ayatollah Ali Khamenei's aversion to Washington is a formidable barrier to any diplomatic solution.
In the penultimate sentence of his speech, Rohani raised the possibility of talks.
"This is the message of the Iranian nation: Let's invest on hope towards a better future rather than in war and violence," he said. "Let's return to justice; to peace; to law, commitment and promise and finally to the negotiating table."