The Strait of Hormuz, a chokepoint for about a fifth of the world’s oil, has again become the chaotic centre of the United States-Israel war on Iran, as a standoff between Washington and Tehran is complicating efforts to end the war.Iran on Saturday reversed its decision on reopening the strait, and its military opened fire at a ship trying to pass through the waterway after US President Donald Trump said Washington will continue its blockade on Iranian ports.Recommended Stories list of 3 itemsend of listTrump has refused to end the blockade until a deal is finalised. On Saturday, he said that there have been “very good” discussions, but Washington won’t be “blackmailed”.After a short-lived rise in transit attempts on Saturday, ships in the Persian Gulf once again stayed put, after reports of vessels coming under fire mid-passage and being forced to withdraw.Their pullback restored the strait to its pre-ceasefire status, raising the risk of a worsening global energy crunch and increasing the likelihood of renewed fighting.Here is what you need to know:What has Iran said?Iranian Foreign Minister Abbas Araghchi on Friday said the strait would be open for commercial vessels during the truce, which ends on April 22, in “line with the ceasefire in Lebanon”.However, Iran’s Islamic Revolutionary Guard Corps (IRGC) announced a clear reversal in Iran’s position, saying the Strait of Hormuz would not return to its “previous state”, amid the blockade of Iranian ports.The IRGC’s joint military command said the US has “co …