Iran called on Washington on Monday to abandon its "warmongering policy, intervention, Iranophobia and sales of unsafe and useless weapons to the main sponsors of terrorism", according to state-run Press TV.
"America is reinvigorating terrorists in the region by its hostile policies", state television quoted Foreign Ministry spokesman Bahram Qassemi a day after U.S. president Donald Trump signed an arms deal with Tehran's arch-foe Saudi Arabia and singled out Iran as a source of support for militants.
"Unfortunately, under the hostile and aggressive policies of the American statesmen, we are witnessing a renewed strengthening of terrorist groups in the region and miscalculation of the dictatorships which support these groups", Qassemi said.
Zarif, in his response, noted that Saudi Arabia signed a major military deal with the United States during Trump's visit.
Speaking before Arab leaders in Riyadh on Sunday, Trump urged unity in efforts to control the spread of Iranian influence.
However, it's anyone's guess how successful Iran will be on the worldwide stage, given that Trump is now trying to develop a coalition of Middle Eastern states to oppose the nation on the grounds it "funds arms and trains terrorists, militias, and other extremest groups".
"For decades, Iran has fueled the fires of sectarian conflict and terror".
"It is a government that speaks openly of mass murder, vowing the destruction of Israel, death to America", he said, and called for its worldwide isolation.
In a tweet following the speech, Iranian Foreign Minister Javad Zarif accused Trump of ignoring Iran's democratic credentials to "milk" Saudi Arabia of billions of dollars.
Reformist candidates swept municipal elections in Iran's capital, taking all 21 seats in Tehran as moderate President Hassan Rouhani won a second term, state media reported Monday. He'll serve another four years in the post.
Rouhani, a cleric whose administration struck the 2015 landmark nuclear deal with world powers, decisively won a second term in Friday's election.
"All nations of conscience must work together to isolate Iran", said Trump, striking a confrontational stance toward Tehran that had been avoided by his White House predecessor, Barack Obama.
The new week began on a familiar note, with Saudi Arabia on Monday claiming that the Organization of the Petroleum Exporting Countries (OPEC) crude cutbacks have helped rebalance the market, and reports strongly suggesting that any rebalance could be obliterated - this time in the form of Iran bragging that it is able to boost production by 3 million barrels per day (bpd).
"Of all places, the US president uses this bastion of democracy and moderation to attack Iran shortly after its democratic election", noted Iranian Foreign Minister Mohammad Javad Zarif on the microblogging site.