A major part of the new US push is an executive order targeting those who buy or sell Iran conventional arms that was previously reported by Reuters and will also be unveiled by the Trump administration on Monday
The United States on Monday will sanction more than two dozen people and entities involved in Iran's nuclear, missile and conventional arms programs, a senior US official said, putting teeth behind UN sanctions on Tehran that Washington argues have resumed despite the opposition of allies and adversaries.
Speaking on condition of anonymity, the official said Iran could have enough fissile material for a nuclear weapon by the end of the year and that Tehran has resumed long-range missile cooperation with nuclear-armed North Korea. He did not provide detailed evidence regarding either assertion.
The new sanctions fit into US President Donald Trump's effort to limit Iran's regional influence and come a week after US-brokered deals for the United Arab Emirates and Bahrain to normalize ties with Israel, pacts that may coalesce a wider coalition against Iran while appealing to pro-Israel US voters ahead of the November 3 election.
The new sanctions also put European allies, China and Russia on notice that while their inclination may be to ignore the US drive to maintain the UN sanctions on Iran, companies based in their nations would feel the bite for violating them.
A major part of the new US push is an executive order targeting those who buy or sell Iran conventional arms that was previously reported by Reuters and will also be unveiled by the Trump administration on Monday, the official said.
The Trump administration suspects Iran of seeking nuclear weapons - something Tehran denies - and Monday's punitive steps are the latest in a series seeking to stymie Iran's atomic program, which US ally Israel views as an existential threat.
The official argued Iran wants a nuclear weapons capability and the means to deliver it despite the 2015 deal that sought to prevent this by restraining Iran's atomic program in return for access to the world market.
In May 2018, Trump abandoned that agreement to the dismay of the other parties - Britain, China, France, Germany and Russia - and restored US sanctions that have crippled Iran's economy.
Iran, in turn, has gradually breached the central limits in that deal, according to the International Atomic Energy Agency (IAEA), including on the size of its stockpile of low-enriched uranium as well as the level of purity to which it was allowed to enrich uranium.
The Vienna-based agency has said Iran only began significantly breaching the 2015 deal's limits after the US withdrawal and it is still enriching uranium only up to 4.5%, well below the 20% it had achieved before that agreement, let alone the roughly 90% purity that is considered weapons-grade, suitable for an atomic bomb.
Asked to comment on the impending new US sanctions and the US official's other statements, a spokesman for Iran's mission to the United Nations dismissed them as propaganda and said they would further isolate the United States.
"The US' 'maximum pressure' show, which includes new propaganda measures almost every week, has clearly failed miserably, and announcing new measures will not change this fact," the mission's spokesman, Alireza Miryousefi, told Reuters in an email.
The White House declined comment in advance of Monday's announcements.
'Snap back' of un sanctions?
The US official confirmed Trump will issue an executive order that would allow the United States to punish those who buy or sell conventional arms to Iran with secondary sanctions, depriving them of access to the US market.
The proximate cause for this US action is the impending expiration of a UN arms embargo on Iran and to warn foreign actors - US entities are already barred from such trade - that if they buy or sell arms to Iran they will face US sanctions.
Under the 2015 nuclear deal the UN conventional arms embargo is set to expire on October 18.
The United States says it has triggered a "snap back," or resumption, of virtually all UN sanctions on Iran, including the arms embargo, to come into effect on 0000 GMT on Sunday.
Other parties to the nuclear deal and most UN Security Council members have said they do not believe the United States has the right to reimpose the UN sanctions and that the US move has no legal effect.
On Friday, Britain, France and Germany told the Security Council that UN sanctions relief for Iran - agreed under the 2015 nuclear deal - would continue beyond Sunday, despite Washington's assertion.
In letters to the Security Council on Saturday, China's UN Ambassador Zhang Jun and Russia's UN Ambassador Vassily Nebenzia both described the US move as "illegitimate" and said the UN sanctions relief for Iran would continue.
Also, on Saturday, UN Secretary-General Antonio Guterres told the Security Council he cannot act on the US declaration that UN sanctions had been reimposed because it was not clear whether they had snapped back.