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Asian stock markets experienced a significant downturn on Monday, with South Korea's KOSPI index plummeting 6.5% and Japan's Nikkei 225 falling 3.5%. The Hang Seng Index in Hong Kong tumbled more than 4%, while Australia's ASX 200 closed 0.75% lower and New Zealand's NZX 50 was down 0.7%.The turmoil was triggered by US President Donald Trump's ultimatum to Iran, warning the country to reopen the Strait of Hormuz or face the destruction of its energy infrastructure within 48 hours. The strait is a critical waterway through which about one-fifth of global oil and natural gas exports usually transit.Trump's threat has added to fears of a cascading global energy crisis as the US and Israel's war on Iran approaches its one-month mark with no clear end in sight. Oil prices have surged more than 50% since the start of the war, which began on February 28. Analysts warn that energy prices are likely to rise significantly further if the strait remains effectively closed, with some predicting oil to hit $150 or even $200 a barrel.In response to Trump's ultimatum, Tehran has warned it will completely close the waterway and launch retaliatory attacks on energy and water infrastructure across the region if Trump follows through on his threat. The deadline for Trump's ultimatum is set to expire at 23:44 GMT on Monday.European markets also saw significant losses, with London's FTSE 100 down 1.4% and the DAX 40 in Frankfurt falling about 2% in morning trading. On Wall Street, US stocks saw significant losses ahead of Monday's opening, with futures tied to the S&P; 500 down about 0.8% as of 07:00 GMT.