Iran threatened to establish a maritime exclusion zone across the Persian Gulf in response to what it called U.S. economic warfare, while Iran-backed Houthi militants injured 73 people in attacks on several locations in Saudi Arabia. Mohsen Rezaei, secretary of Iran's Supreme National Security Council, said Iran’s posture toward U.S. warships and bases had been fundamentally recalibrated after U.S. forces struck three Iranian oil tankers on Saturday. Iranian officials said vessels entering the proposed zone could be placed on an Iranian sanctions list and that Tehran planned to publish maps for a new shipping corridor through the Strait of Hormuz. Iranian state media said Iran fired the Qassem Basir missile at several U.S. vessels near the strait, while the U.S. military said its warships evaded the attacks. Parliament Speaker Mohammad Bagher Qalibaf warned that U.S. energy companies and Gulf infrastructure could face retaliation if Washington attacked Iranian oil and gas facilities. Brent crude rose 1% to $98.01 a barrel by 01:48 ET, reflecting concern over supply disruption in a waterway that handled about one-fifth of global oil and liquefied natural gas shipments before the conflict. The Houthi attacks add to longstanding tensions in Yemen, where large-scale fighting declined after a UN-brokered truce in 2022 but remains at risk of renewed escalation. Existing market pricing has suggested a lower probability of regime change in Iran before 2027. Further Iranian military actions, Saudi-led coalition responses and diplomatic efforts will remain key developments for energy markets and regional security.