Updated

The United States has blocked Iran's nuclear chief, Mohammad Eslami, from attending a key conference in Vienna, with Iran accusing Washington of pressuring Austria to revoke his visa. Iran has called the move a violation of member states' rights, further straining already tense nuclear diplomacy. Austria separately denied entry to another Iranian official following a UN ruling, which Iran says represents a reversal of prior approval for its delegation to the IAEA under external pressure. The incidents come amid stalled broader talks between Iran and Gulf states, deepening friction over Iran's nuclear program and its diplomatic standing.