Iran’s nuclear-safety regulators have stopped answering telephone calls from the International Atomic Energy Agency, according to two officials cited by Bloomberg on 1 July. The step comes less than a week after Tehran formally halted on-site inspections, eliminating the UN watchdog’s real-time visibility into the Islamic Republic’s atomic programme. The breakdown in communications deepens a confrontation that intensified after Israeli and US strikes on Iranian nuclear sites in mid-June. Parliament has since voted to suspend cooperation with the IAEA, and President Masoud Pezeshkian has rejected Director-General Rafael Grossi’s request to visit damaged facilities. With inspectors barred and the IAEA unable to reach Iranian counterparts, the location of roughly 409 kilograms of enriched uranium cited in earlier agency reports is now unclear. Western governments have urged Tehran to restore access, warning that the escalating opacity risks further destabilising efforts to curb Iran’s nuclear capabilities.