By Ahmad Ghaddar and Yousef Saba LONDON, April 6 (Reuters) – The Strait of Hormuz’s closure and the resulting surge in global oil prices have handed ⁠financial ⁠windfalls to Iran, Oman and Saudi Arabia, while other states that lack alternative ⁠shipment routes have lost billions of dollars, a Reuters analysis found. Iran effectively shut the Strait – a route for about a fifth of global oil and LNG flows – after U.S. and Israeli ​airstrikes on Iran at the end of February led to a widening conflict. It later said it would allow transits by vessels that had no U.S. or Israeli links. As a result, some tankers have managed to cross the narrow waterway, but energy markets have still experienced unprecedented disruption. International ‌Brent crude rose by 60% in March, a record monthly increase. U.S. President ‌Donald Trump has threatened to rain “hell” on Tehran unless it makes a deal by the end of Tuesday that would allow traffic to start moving through the Strait of Hormuz. GEOGRAPHY DETERMINES OIL FORTUNES While much of …