A tractor driver in Ukraine was killed when he drove over a Russian antitank mine near Chernihiv, Ukrainian police said on Thursday. It is believed to be the first case of a tractor detonating a mine in Ukraine since Russia’s Feb. 24 invasion.

Ukrainian tractors have become a symbol of the country’s resistance since the war began, and the incident comes as Ukraine’s sowing season ramps up amid global food shortage worries. Ukrainian authorities are investigating the farmer’s death as a “violation of laws and customs of war.”

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