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. 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. 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 nuclear deal lifted international sanctions in exchange for Iran agreeing to restrictions on its nuclear program. one of the European diplomats said, referring to concerns that the US is eyeing government change as the sanctions' end goal.