USA and Israel bombed Iran, including killing its leaders.

Iran responded by attacking American bases in neighboring countries, and closing the Strait (defended with land based missiles and underwater sea mines).

Eventually some stuff was let through, mostly China’s oil.

At the same time, Israel started expanding into Lebanon. Iran said no opening the strait until bombing stops there.

USA says “ok no more Israel bombing there, but we are ALSO blockading the strait and stopping anything going to Iran’s ports, or anything to/from Russia and China”

Now Iran also blocking it again, so nothing gets through, because no one is following through on their promises.