The deployment of an advanced United States anti-missile system to Israel, along with 100 troops to operate it, marks a significant escalation in US entanglement with a widening Israeli war that Washington has already heavily subsidised. But the deployment – in anticipation of an Iranian response to an expected Israeli attack on Iran – also raises questions about the legality of US involvement at a time when the administration of US President Joe Biden is facing growing backlash over its unwavering support for Israel. It also comes as US