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Russian forces have contaminated up to 65,000 square miles of Ukrainian territory with mines, said President Volodymyr Zelensky, as the U.S. outlined support for tackling a threat it described as the biggest of its kind since World War II.
Mines and unexploded ordnance pose a growing challenge as Ukrainian troops drive Russian forces back, having reclaimed more than half the territory Moscow seized since the start of its invasion on Feb. 24.
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