The killing of three American soldiers in Jordan and the wounding of dozens more, allegedly by an Iranian-backed group, is a red line that was always likely to be crossed in what is becoming an increasingly dangerous region.
The US had up to this weekend avoided fatalities in more than 150 attacks on its military bases by Iranian proxies since the outbreak of the Israel-Hamas war after the 7 October attacks, but that luck could not last for ever. The question now is what lies on the far side of that red line.
