Ukraine war latest: Russia's Syzran oil refinery hit by 'another long range sanction'

Key developments on May 21: * 'Another long-range sanction' — Ukraine strikes Syzran oil refinery, more than 800 kilometers from border * Russia allegedly delivers nuclear warheads for joint exercises with Belarus * Ukraine strikes Russian FSB headquarters in occupied Kherson Oblast, killing and injuring nearly 100 troops * Ukraine developing new low-cost way to down Russian Shahed-type drones * Russian drones hits apartment buildings in Dnipro injuring 15, including 13-year-old boy Ukrai

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