The US-Israeli military action will test the fragile rules governing the use of forceThe killing of Iran’s supreme leader, Ayatollah Ali Khamenei, by a US-Israeli strike is a targeted assassination of a head of state. It also marks a grave escalation in a region already burdened with smouldering wars and fragile states. The consequences of the deliberate strike will reverberate across a Middle East marked by the aftershocks of foreign intervention. Revulsion against the hardline regime in Tehran, or the desire for a better future for the Iranian people, does not confer a legal justification.Force is lawful, under the UN charter, only in self-defence against an imminent attack or with security council approval. Neither condition has been met. There was no evidence of an “instant, overwhelming” Iranian attack being prepared. What Donald Trump’s Operation Epic Fury looks like is not pre-emption but prevention: a decision to eliminate a future risk while an enemy appeared weak. It is a war of choice. Mr Trump’s call to overthrow a sovereign government was extraordinary. Continue reading...