The EU would be forced to re-impose sanctions on Iran if Tehran reneges on parts of the nuclear deal, a French presidency source said.

“We do not want Tehran to announce tomorrow actions that would violate the nuclear agreement, because in this case, we Europeans, would be obliged to re-impose sanctions as per the terms of the agreement,” the source said. “We don’t want that and we hope that the Iranians will not make this decision.”

“We sent messages to Tehran to say that we were determined to implement the agreement, that we really wanted them to stay in this agreement even though we took into account the complexity of the situation and passed on the same messages to our American allies,” the source continued. “Tomorrow, depending on what is in the statement from Tehran, at this stage what we’re expecting is a collective European reaction but as we do not yet know exactly what will be in it, we are preparing for different eventualities”

Soon after, Iranian state media agency IRNA reported that the Iranian Foreign Ministry would “announce its decision to diminish its commitments to the nuclear deal … after the unilateral U.S. withdrawal.” The report also said that President Hassan Rouhani would send a letter to the envoys of Russia, China, Germany, France and Britain, the deal’s five remaining signatories.