The wisest course from here would seem to be reopening discussions with Tehran about Gulf security and an American-imposed sanctions regime. But this will be easier said than done.
The US has imposed new sanctions against Iran's top leaders, but its foreign policy has no clear focus.
Trump announced 'hard-hitting' new sanctions on Iran in response to the attack on a US drone. A peace studies scholar explains why sanctions rarely work.
Washington's reimposition of harsh sanctions against Iran is one of the Trump administration's most irresponsible acts.
If Iranian crude exports decline further it could make oil and gas prices rise.
The Iranian government reacted to a nationwide truck drivers' strike with unprecedented restraint, apparently fearful a crackdown might provoke a Trump intervention.
The Iran nuclear deal will struggle to survive the damage done when Trump pulled the US out on May 8. So will US-Europe relations.