13th April 2026
What the U.S. blockade actually involves.
1) It targets Iranian ports — not the entire strait
The U.S. military (CENTCOM) says it will block all ships going to or from Iranian ports.
This includes:
Ports on the Persian Gulf
Ports on the Gulf of Oman
So this is not a total closure of global shipping lanes.
2) Ships from any country can be stopped
The blockade applies "impartially" to vessels of all nations if they are:
Entering Iran
Leaving Iran
That means even non-Iranian ships trading with Iran could be intercepted.
3) Transit through the strait is still (technically) allowed
The U.S. says it will not block ships just passing through the strait if they are:
Going between non-Iranian countries
In theory:
Saudi India oil shipments allowed
UAE Europe shipments allowed
Iran anywhere blocked
4) Enforcement likely means naval interception, not immediate attacks
Experts expect tactics like:
Boarding vessels
Turning ships away
Escorting or inspecting tankers
It's a naval control operation, not an outright shooting blockade (at least initially).
5) It starts at a fixed time and is militarily coordinated
Start time: April 13, 10 a.m. ET (14:00 GMT)
Run by: U.S. Navy under Central Command (CENTCOM)
Additional guidance issued to commercial shipping
6) Parallel military actions are happening
Alongside the blockade, the U.S. is:
Clearing sea mines in the strait
Deploying drones, ships, and helicopters to secure routes
This suggests the goal is both:
Restrict Iran
Keep global shipping moving (at least partially)
Why this still shakes global markets
Even though it’s not a full closure, it’s still hugely disruptive:
“Grey zone” problem
Ships can pass — but:
Risk of interception
Insurance costs surge
Crews reluctant to enter
Result: many tankers are already avoiding the area
Risk of escalation
Iran has warned it may treat the blockade as a ceasefire violation
Any clash at sea could:
Shut the strait fully
Trigger wider conflict
It still restricts real supply
Even without a full shutdown:
Iranian oil exports are effectively cut off
Some global flows slow down due to disruption
Bottom line
The U.S. blockade is more targeted than it first sounded:
It is:
A naval blockade of Iranian trade
A ban on ships entering/leaving Iran by sea
It is NOT:
A complete closure of the Strait of Hormuz
A blanket stop on all global oil shipping
But in practice, markets are reacting as if it could become a full blockade — because the situation is unstable and could escalate very quickly.