Under international law, the legality of the blockade is “more ambiguous,” said Jennifer Kavanagh, a senior fellow and director of military analysis at Defense Priorities, a foreign policy think tank in Washington.
For a blockade to be legal, Ms. Kavanagh said, it must be “effective,” meaning that it is both enforceable and enforced. Some would argue that a “‘global blockade’ is not permissible in conception” because it is overly broad, she said.
The expanded blockade “marks a notable escalation by the United States,” said Ms. Kavanagh.
Still, she said, it is unlikely to significantly change Iranian calculations.
“For Iran, this war is existential and it is not going to cave easily or quickly,” she said. “Economic pressure may work over the very long term, but Trump seems too impatient for a deal to wait it out.”
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