Russia has imposed a diesel export ban after repeated Ukrainian drone strikes disrupted major refineries and fuel infrastructure, triggering fresh concerns over global energy markets. President Vladimir Putin has ordered emergency fuel subsidies in occupied Crimea as shortages deepen, while Ukraine says it is deliberately targeting Russia's wartime logistics by striking refineries, oil depots, and shadow fleet vessels. The developments come as the Iran conflict continues to keep the Strait of Hormuz under pressure, adding further uncertainty to global oil supplies.