New York/London, April 13 -- President Donald Trump's plan to blockade the Strait of Hormuz would halt the nearly 2 million barrels a day (bpd) of Iranian oil that's been passing through the waterway, further squeezing global supply and cutting off a vital lifeline for the Islamic Republic. On Sunday, ship transits remained at greatly reduced levels in the face of Tehran's stranglehold on the world's most important energy chokepoint, with most vessel owners reluctant to operate in an area that until recently was a war zone. There had been some signs of improving traffic in recent days, not least when three non-Iranian supertankers transited Hormuz. While it was only a single day, that flow equates to six million barrels a day, a volume that...