US President Donald Trump has made threatening statements against Iran, raising concerns about war crimes. Experts say the consequences for Trump are unlikely in the near term, as his administration undermines international institutions.

Threatening to destroy Iran’s electricity grid and to reduce the country of 90 million to destitution, US President Donald Trump is shattering precedent by not just accepting but gloating about acts seen as potential war crimes. The consequences for Trump, at least in the near term, are probably none, experts say, as his administration works hard to undermine international institutions tasked with keeping norms. The Geneva Conventions governing the laws of war, agreed following World War II,...