White House seems to have failed to anticipate that Tehran would fight back by trying to impose costs on the west

• Middle East crisis – live updates

If there was a moment when the absence of a US strategy on Iran was exposed, then this was it. Donald Trump demanded on Saturday that the UK, China, France, Japan and others participate in a naval escort for oil tankers through the strait of Hormuz.

Despite launching the attack on Iran, with Israel, the White House does not seem to have fully anticipated what was likely to follow. Iran had few good military options for fighting back, but attacking US bases, US allies and merchant shipping in the Gulf was the most obvious response – to try to impose costs on the west.