German Foreign Minister Heiko Maas met in Washington with US Secretary of State Mike Pompeo who has voiced outrage over European plans to preserve commercial ties with Iran.

"In the end, we pursue the same goals with respect to Iran," Maas told reporters after meeting Pompeo.

"We just have different paths that we want to follow," he said.

Maas said that Germany shared concerns about Iran's ballistic missile program and believed Tehran should withdraw from Syria, where the Shiite clerical regime is supporting President Bashar al-Assad.

But Maas said that the end of the 2015 agreement would lead Iran to pursue a nuclear program with military purposes.

"This would create the danger of a military conflict in the region," Maas said.

The United States under former president Barack Obama negotiated the deal with Iran alongside Britain, China, France, Germany and Russia.

UN inspectors say that Iran has complied with the agreement, under which it ceased sensitive nuclear work in exchange for sanctions relief.

President Donald Trump withdrew from the accord, vowing instead to target Iran aggressively and roll back its role in the region.

That European Union said last month that it was working on a legal entity through which businesses could trade with Iran and avoid US sanctions.