Ukrainian Mi-8 and Mi-24 combat helicopters prepare for landing between the fighting with Russian troops in Donetsk region, Ukraine, Saturday, March 18, 2023. (AP Photo/Evgeniy Maloletka)
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A Ukrainian serviceman refuels a Mi-24 combat helicopter between fighting with Russian troops in Donetsk region, Ukraine, Saturday, March 18, 2023. (AP Photo/Evgeniy Maloletka)
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A dog licks her nose in front of a Ukrainian Mi-24 combat helicopter in Donetsk region, Ukraine, Saturday, March 18, 2023. (AP Photo/Evgeniy Maloletka)
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A Ukrainian pilot prepares for a flight on his Mi-24 attack helicopter during a combat mission in Donetsk region, Ukraine, Saturday, March 18, 2023. (AP Photo/Evgeniy Maloletka)
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A Ukrainian pilot prepares for a flight on his Mi-24 attack helicopter during during a combat mission in Donetsk region, Ukraine, Saturday, March 18, 2023. (AP Photo/Evgeniy Maloletka)
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A Ukrainian Mi-24 attack helicopter flies towards Russian positions during a combat mission in Donetsk region, Ukraine, Saturday, March 18, 2023. (AP Photo/Evgeniy Maloletka)
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A Ukrainian Mi-24 attack helicopter flies towards Russian positions during a combat mission in Donetsk region, Ukraine, Saturday, March 18, 2023. (AP Photo/Evgeniy Maloletka)
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Ukrainian Mi-8 combat helicopters take off towards Russian positions during a combat mission in Donetsk region, Ukraine, Saturday, March 18, 2023. (AP Photo/Evgeniy Maloletka)
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A Ukrainian pilot waves to his comrades from a Mi-8 combat helicopters during a combat mission in Donetsk region, Ukraine, Saturday, March 18, 2023. (AP Photo/Evgeniy Maloletka)
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A Ukrainian Mi-24 attack helicopter flies towards Russian positions during a combat mission in Donetsk region, Ukraine, Saturday, March 18, 2023. (AP Photo/Evgeniy Maloletka)