Friday's attack on two oil tankers in the Gulf of Oman, just outside the Strait of Hormuz, where about a fifth of the world's energy traffic passes, has triggered accusatory exchanges between Washington and Tehran. The Trump administration considers the Iranian government responsible for the incidents; President Ruhani rejects all charges.

One year after the US's unilateral withdrawal from the nuclear agreement with Iran, 21 directors and senior researchers from leading European think tanks highlight the grave consequences of the US decision and call on Washington to rejoin the nuclear deal.