"They charge in groups of 4 or 6...they also move on bicycles, on motorcycles, on quads. So they're more manoeuvrable, you rarely see heavy armour near the front."

Russia's human wave tactics often take days and hundreds of lives as Putin's troops try to avoid drones and artillery by crossing open land on foot or even by bike, Journalist and researcher David Kirichenko tells Frontline on #timesradio

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