US blockade of Iranian ports might be an effective negotiating tactic: defence expert | ABC NEWS

Maritime security and defence expert Jennifer Parker explains the legality of what Trump is proposing in the Strait of Hormuz. She says it is not in fact a blockade on the Strait, which is an international waterway, but rather a blockade on vessels going to and from Iranian ports. 
Parker says blocking ships from Iranian ports will be an effective way for the United States to apply economic pressure on Iran without strikes and the destruction of infrastructure. 

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