What changed: Mutual insurance clubs (London P&I, Skuld, American Club, etc.) have canceled war risk coverage for commercial vessels in the Persian Gulf and Gulf of Oman, issuing a standard 72-hour notice. The U.S. responded with government guarantees through the DFC and the Navy's readiness to actively escort tankers.
Why it matters: The insurers' decision has effectively choked off access to roughly 20% of global oil and LNG supplies. The driving factor is not a physical Iranian blockade, but the stringent risk models of insurance syndicates. Even the recently announced OPEC+ production hikes are rendered moot, as the additional physical volumes are trapped inside the conflict zone.
Amplified risk: A global stagflationary shock, a cascading paralysis of maritime logistics, and acute energy deficits spanning across Asia and Europe.