The United States and Iran have now exchanged fire for eight consecutive days, in a spiral of escalation touched off by an Iranian strike on a US base in Jordan that killed two American soldiers and left a third unaccounted for. What began as a shadow conflict has hardened into open, if still limited, exchanges between the two militaries.

“Godspeed, heroes. Their sacrifice only stiffens our resolve.” — US Defence Secretary Pete Hegseth

Iranian media said an under-construction nuclear power plant in the south-western city of Darkhoveyn was hit overnight, along with Qeshm Island near the Strait of Hormuz. In Kuwait, an electricity and water plant was struck for the second time in two days, local officials said, and a fire broke out. Later on Sunday, Jordanian forces shot down three Iranian missiles, with a fourth falling in a remote area, after a US warning that the port of Aqaba could be targeted.

Washington, for its part, has reimposed a blockade of Iranian ports, and Tehran has declared the Strait of Hormuz - through which a fifth of the world's oil moves - closed. Their preliminary ceasefire collapsed less than a month after it was agreed. The Revolutionary Guard warned that vessels ignoring its orders in the waterway had been involved in an "accident" and threatened further incidents against ships it said were following unsafe routes under American influence.

The US military said its eighth successive night of attacks was designed to degrade Iran's ability to threaten commercial shipping in the Strait of Hormuz and to punish the forces that struck American personnel in Jordan. Verified footage from inside the Jordanian facility showed at least two impacts and an explosion, a visible reminder of how close the fighting has come to US troops.

Defence Secretary Pete Hegseth paid tribute to the fallen, saying their sacrifice had stiffened American resolve. The US death toll in the conflict has reached sixteen after a Navy pilot missing earlier this month was declared dead. Iran's health ministry says at least fifty people have been killed and more than five hundred injured in US strikes over the past three weeks.

The Gulf Cooperation Council - an alliance of Bahrain, Kuwait, Oman, Qatar, Saudi Arabia and the United Arab Emirates - accused Tehran of targeting civilian infrastructure after the strikes on Kuwaiti plants. Kuwait said the same power and water distillation facility had now been hit twice in two days. Diplomats warn that any miscalculation could draw in forces across the region, turning a bilateral spat into a conflagration with global economic consequences.

The coming days will show whether the strikes harden into a wider regional war or pause for negotiation; for now the fighting is being measured in ships, missiles and the price of oil.

The detail that should worry markets most is not the nightly strikes but the insurance math around the Strait of Hormuz. If underwriters begin repricing, or refusing, transit outright rather than charging more, tanker traffic can seize regardless of any military outcome, and that, not rhetoric, is what would force both capitals to talk.