But in a sign of brewing confrontation a year after Washington quit world powers' 2015 nuclear deal with Iran and reimposed sanctions on it, Tehran announced a fourfold increase in its rate of production of low-grade uranium enrichment.
US President Donald Trump unilaterally pulled out of the nuclear deal previous year and has since reintroduced crippling sanctions on Iran's economy.
"The fault lies with the Iranians, not the United States or any other nation".
The relationship between Washington and Tehran has become increasingly strained in recent weeks, raising concerns about a potential U.S. -Iran conflict.
"The enemies of Islamic Iran are incapable in operation fields and have resorted to media warfare due to their fear of Iran's military power", Iranian Gen. Ali Hajilou said at a military ceremony in Mianeh.
Last week Yemen´s Huthi rebels - who are backed by Iran and are being bombarded by USA ally Saudi Arabia - claimed responsibility for a drone attack on a key oil pipeline inside the kingdom. "Never threaten the United States again!"Iranian officials say the country is not looking for war".
Saudi Arabia does not want war but will not hesitate to defend itself against Iran, a top Saudi diplomat said Sunday after the kingdom's energy sector was targeted this past week amid heightened tensions in the Persian Gulf.
British Foreign Secretary Jeremy Hunt told journalists in Geneva that Iran should not doubt the USA resolve, warning that "if American interests are attacked, they will retaliate".
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The US official said he discussed with Lavrov the general situation in Syria . And he did say that the US does not want to have war.
"President Trump has claimed that he doesn't want war, but his bombastic rhetoric is ensuring that he walks into one".
Meanwhile, Oman's minister of state for foreign affairs made a previously unannounced visit Monday to Tehran, seeing Zarif, the state-run IRNA news agency reported. On Monday, U.K. officials said the US would be ready with a counter-strike if Tehran moved to attack American interests. When asked why Democratic primary voters should back him over his mentor, Moulton said: "I think it's time for the generation that fought in Iraq and Afghanistan to take over for the generation that sent us there".
In his own message on Twitter, Zarif said Trump had been "goaded" into "genocidal taunts".
Mr Trump "hopes to achieve what Alexander [the Great], Genghis [Khan] & other aggressors failed to do".
He also noted: 'I ended the Iran nuclear deal, and actually, I must tell you - I had no idea it was going to be as strong as it was.
It was not clear precisely what Trump meant by his tweet on Sunday, however, since it ran counter to reports from late last week that he had told USA military commanders he did not want to go to war and, in fact, wanted to reduce bilateral tensions.
"Iranians have stood tall for millennia while aggressors all gone", Zarif wrote.
Brennan, an outspoken critic of President Donald Trump, is scheduled to talk to House Democrats at a private weekly caucus meeting Tuesday, according to a Democratic aide and another person familiar with the private meeting.
Iranian Foreign Minister Mohammad Javad Zarif tweeted that Trump was making "genocidal taunts".
"#NeverThreatenAnIranian. Try respect - it works!"