As US threatens to attack civilian infrastructure, UK’s distinction between defence and attack grows harder to sustain

Donald Trump says ‘a whole civilisation will die’ if Iran ignores demands

In Downing Street, Keir Starmer has been at pains to emphasise that he will only authorise the use of UK bases by the US for “defensive” strikes on Iranian military targets. In the White House, Donald Trump has threatened to bomb civilian infrastructure – and said on Monday that he was “not at all” worried about committing war crimes.

So far in the war, Starmer’s position has allowed him to present the UK as a responsible actor concerned for regional security – but not a direct participant in the conflict on the US side.

But while that has incurred Trump’s displeasure, it has also drawn questions about whether it is legally plausible to neatly divide defensive and offensive operations – and if US attacks do begin against targets such as bridges and power plants, scrutiny of the British position will intensify even if those attacks are not launched from UK bases.