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(FILES) A pilot practices with a drone on a training ground in Kyiv region on February 29, 2024, amid the Russian invasion of Ukraine. Ukraine is banking on massive use of drones to compensate for the shortage of artillery shells and undermine Russian military capabilities. But if they have become essential for the two belligerents, they cannot tip the scales, experts believe. (Photo by Genya SAVILOV / AFP) (KEYSTONE/AFP/GENYA SAVILOV)