Neither Tehran nor Washington want a war but the campaign of maximum pressure and the impulse for revenge mean they remain on collision course

The safety net that prevented a new Middle East catastrophe overnight has always been there. Neither the US nor Iran wants to go to war with each other. But it is a failsafe that has been tested too fecklessly too many times – and there is no reason to assume it will continue to hold indefinitely.

The fact there have been no confirmed reports of casualties from Iran’s missile strikes on military bases in Iraq may be due to early warning systems or the fact that Iraq’s government was tipped off so Americans and Iraqis had enough time to take cover. But the intention seems to have been to keep the strike limited and proportional.