Germany’s foreign minister will meet Iranian President Hassan Rouhani in Tehran on Monday, a German diplomatic source said, as part of a concerted European effort to preserve Iran’s nuclear pact with world powers and defuse rising U.S.-Iranian tensions.

West European signatories, including Germany, want to try to keep the nuclear accord alive although they share the Trump administration’s disquiet about Iran’s ballistic missile programme and its role in conflicts around in the Middle East.

Germany, France and Britain maintain that the nuclear pact remains the best way to limit Iran’s enrichment of uranium, a potential pathway to the development of nuclear weapons, and to seek agreement with Iran on other security issues in future.

“We Europeans are convinced that it is worth trying to keep the Vienna nuclear agreement with Iran,” Maas said, adding he wanted dialogue even when disputes seemed insurmountable.

Washington has sent more military forces to the Middle East, including an aircraft carrier, B-52 bombers and Patriot missiles, in a show of force against what U.S. officials call Iranian threats to U.S. troops and interests in the region.

Last month, Iran scaled back some commitments under the 2015 deal and warned that in 60 days it would resume refining uranium to a higher fissile degree than that permitted by the accord if Europe failed to shield its trade benefits from U.S. sanctions.

“I can confirm that the Foreign Minister will meet President Rouhani on Monday,” said the diplomatic source, giving no further details.

German Foreign Minister Heiko Maas warned during a weekend stopover in Iraq en route to Tehran about the dangers of any conflict with Iran for the entire Middle East.

Iran has always said its nuclear activity is peaceful and refuses to put its missile and military capabilities on the negotiating table, as the Trump administration has demanded.

Iranian Foreign Minister Mohammad Javad Zarif was quoted by Fars news agency on Sunday as saying Maas’s trip to Tehran showed Germany was trying to “keep the (nuclear deal) alive”.