Spokesman Stephane Dujarric told reporters at the UN's NY headquarters that the worldwide body is "concerned about the rising rhetoric", further asking all parties concerned to take a calmer approach in a complex region.
The Trump administration recently ordered warships and bombers to the region to counter the supposed threat from Iran that forced the US earlier this week to pull all non-essential USA government personnel from Iraq.
Trump's "maximum pressure" campaign against Iran has exacerbated fissures between the two men, especially "over the tight control Bolton has tried to exert over the national security decision-making process", Politico, an online news service, said. "In the meantime, their economy continues to collapse - very sad for the Iranian people!"
"If Iran wants to fight, that will be the official end of Iran", Trump tweeted on Sunday afternoon.
On Sunday, a rocket landed near the US Embassy in Baghdad's fortified Green Zone, adding to the jitters felt in Iraq - a nation where Iran retains outsize influence. Concerns about a possible conflict have flared since thenWhite House ordered warships and bombers to the region to counter an alleged, Unexplained threat from Iran that has seen America order nonessential diplomatic stuff out of Iraq.
US delay to Huawei ban gives tech sector time to adjust
The Commerce Department said it gave the grace period to give US companies time to adjust and prepare to cut out Huawei. The license also allows Huawei to engage in the development of standards for fifth-generation (5G) telecom networks.
Instead, the news of those deployments elicited a diplomatic backlash against the Trump administration, with allies both in Europe and the Middle East urging caution and insisting they don't want war.
Last year, prior to bringing Bolton into the administration as one of his top advisers, Trump withdrew the U.S. from the Iran nuclear deal.
Iran reportedly said earlier Monday that it has increased its uranium enrichment fourfold, which would likely breach the stockpile limits the 2015 agreement set.
Meanwhile, two Navy guided-missile destroyers, the USS McFaul and USS Gonzalez, have traveled through the Strait of Hormuz on Thursday afternoon without challenge from Iran's Revolutionary Guards Corps, Pentagon defense officials said.
The deal aimed to cut sanctions on Iran in exchange for an end to its nuclear programme, but the United States unilaterally withdrew from the agreement previous year.
Iran is exercising "maximum restraint" in the face of an "unacceptable" escalation by the United States, Zarif said on Thursday.
Gabbard, 38, enlisted in the U.S. Army National Guard after the September 11, 2001 attacks and was twice deployed to the Middle East. Gabbard has said she is running for president to end regime-change wars, though she now trails most of her 2020 opponents in opinion polls.