LONDON — Iran's Supreme National Security Council issued an unprecedented ultimatum Sunday evening, vowing to block the Strait of Hormuz entirely if Israeli or American forces target the country's electrical power generation facilities.

The warning represents Tehran's most explicit threat yet to disrupt global energy supplies, potentially cutting off roughly 20 percent of the world's oil shipments through the narrow waterway that connects the Persian Gulf to international markets.

Escalating Military Operations

Israeli Defense Forces confirmed Sunday that they had demolished the Qasimiyah Bridge in southern Lebanon, a key supply route connecting Hezbollah-controlled territories to the Syrian border. The bridge destruction followed three days of sustained airstrikes targeting Iranian proxy positions across the Levant.

U.S. Central Command acknowledged American participation in what Pentagon officials described as "defensive operations" against Iranian Revolutionary Guard Corps facilities. The joint operations have expanded beyond initial retaliatory strikes to encompass a broader campaign against Tehran's regional military infrastructure.

"We are witnessing the most significant direct confrontation between Israel and Iran since the Islamic Revolution," said Dr. Farid Kazemi, senior fellow at the International Institute for Strategic Studies. "Tehran's Hormuz threat signals they view this as an existential challenge."

Regional Power Grid Vulnerabilities

Iran's power grid has emerged as a critical vulnerability in the current conflict. Intelligence sources indicate that Israeli planners have identified seventeen key electrical substations whose destruction could cripple Iran's industrial capacity and military command systems.

The Islamic Republic's aging power infrastructure, already strained by international sanctions and underinvestment, cannot withstand sustained attacks on generation facilities. Rolling blackouts have already begun in Tehran and other major cities following strikes on two thermal power plants near Isfahan.

Retired Admiral James Morrison, former commander of U.S. Naval Forces Central Command, warned that Iran possesses the military capability to make good on its Hormuz threat. "They have anti-ship missiles, naval mines, and speedboat swarms positioned throughout the strait," Morrison told The Meridian. "Closure would be economically devastating globally."

Global Economic Implications

Crude oil futures spiked 12 percent in Asian trading following Iran's announcement, with Brent crude touching $95 per barrel for the first time since 2022. Energy analysts predict that any sustained Hormuz blockade could drive prices above $120 per barrel within days.

The timing compounds existing supply chain pressures. Saudi Arabia and the UAE have indicated privately that their spare production capacity cannot fully offset Iranian disruption of strait transit, according to Gulf diplomatic sources.

European governments have begun emergency consultations on strategic petroleum reserve releases, while Asian importers are scrambling to secure alternative supply routes through the Suez Canal.

What Comes Next

The confrontation appears set to intensify, with both sides escalating their military postures rather than seeking diplomatic off-ramps. Israeli Prime Minister's office indicated Sunday that operations would continue until Iranian proxy capabilities are "fundamentally degraded."

Tehran's Hormuz ultimatum suggests Iranian leadership believes threatening global energy security provides their strongest deterrent against further attacks on critical infrastructure.

The Biden administration now faces its most complex Middle Eastern crisis, balancing support for Israeli security operations against the economic risks of prolonged energy disruption.

The crisis recalls the 1987 Tanker War dynamics, when similar threats to Persian Gulf shipping triggered international naval intervention.