How a U.S. blockade near the Strait of Hormuz could work

A blockade of Iranian ports that President Donald Trump said began Monday could further disrupt oil prices, has spurred questions about international law and leaves doubts about whether the pressure tactic will force Tehran to reopen the vital Strait of Hormuz. Trump threatened to impose the blockade after talks to further a fragile ceasefire ended without a deal this past weekend. Iran had previously halted nearly all tanker traffic through the key waterway, allowing only some ships perceived as friendly to pass while charging considerable fees. Enforcing the blockade is likely to demand significant resources from the U.S. Navy and…