Kyiv circumvents air defences to target oil supplies, power stations, convoys and bridges, starving Russian front line.

Kyiv is probing Russia’s weakened defences and testing the reach of Western cruise missiles in a bid to raise the Kremlin’s economic and military costs.

Ukrainian drones knocked out power in the biggest city in Russian-held Crimea on Wednesday and targeted facilities in central and southern Russia, underscoring the reach of…