WASHINGTON/TEHERAN— As the US government read­ies to reimpose sanctions on Iran that were lifted under the 2015 nuclear accord, its Euro­pean allies fear greater region­al instability.

US  President  Donald Trump's withdrawal from the landmark agreement,  signed by the United States and five other world powers, is one of the most consequential for­eign policy decisions of his presidency.

Secretary of State Mike Pom­peo said on Sunday that renewed US sanctions on Iran will be rigorously enforced and remain in place until the Iranian government radically changes course. While calling sanctions an important pillar in US policy toward Iran, he said the administration is open to looking beyond sanctions but that would "require enor­mous change" from Teheran.

Pompeo told reporters aboard his plane on his way home from a three­nation trip to South East Asia that the Ira­nian leadership were "bad actors" and said Trump is intent on getting them to "behave like a normal country".

Many US allies believe that such language is code for gov­ernment change, according to two European diplomats involved in negotiations with the US government over how sanctions would be reimposed.

The sanctions that go back into effect on Monday cover Iranian trade in automobiles and metals, including gold.  The US also has banned imports of Iranian products such as carpets and pistachios and revoked licenses that allowed Iran to purchase US and European aircraft.

Iran acquired five new European commercial planes on Sunday before the sales were cut off.

The ATR 72­600 passenger planes landed at Teheran's international  Mehrabad  air­port on Sunday morning.

Abbas  Akhoundi,  Iranian minister of road and urban development, said it is a posi­tive step by the European Union to fulfill its obligations subject to the  bilateral deals signed in the aftermath of the 2015 international nuclear accord.

He also expressed hope that Iran's cooperation with Euro­pean countries, as well as with China,  Russia,  India, Turkey and neighboring states, will help  Iran  tackle the existing difficult situation due to the US sanction threats.

However, the last and most significant sanctions — those on Iran's oil sector and central bank — will be restored on Nov 4. Iranian oil sales are a crucial source of hard currency.

The nuclear deal lifted inter­national sanctions in exchange for Iran agreeing to restrictions on its nuclear pro­gram. UN inspectors said Iran was complying with the deal, but Trump argued that it didn't do enough to curb Iran's "malign activity" in the region.

The surest way

European countries have said they remain committed to the agreement, seeing it as the surest way to safeguard their national security.

"The problem is:  What next?" one of the European diplomats said, referring to concerns that the US is eyeing government change as the sanctions' end goal. Both dip­lomats spoke on condition of anonymity,  as they were not authorized to brief the media on ongoing negotiations.

If the reimposed sanctions caused the government in Teheran to collapse, Iran would likely devolve into civil war like what unfolded in Syr­ia, the diplomat said.

A deepening of Iran's  eco­nomic crisis could also lead to an influx of refugees and migrants into Europe like that seen on the heels of the Syrian conflict.

Supporters of the  Iran agreement have long argued that the US departure would alienate European allies who partnered with the US in the negotiations.

We "remain firmly commit­ted to ensuring (the deal) is upheld and we continue to  abide by our commitments," the second European  diplo­mat said. "If we cannot fulfill these, this risks Iran deciding that it no longer has to abide by the restrictions."

Iran's economy was plunged into a downward spiral follow­ing Trump's announcement that the US was scrapping the deal.

AP—xinhua—Reuters