If the Ukrainians can’t halt the advance, the city of Zaporizhzhia and its 700,000 inhabitants could eventually come under siege. And the Russians’ advance may accelerate as they shift a key unit: the elite 90th Tank Division with its hundreds of T-90M tanks. Most of what the Russians have captured in south Donetsk this year is countryside. Ukraine prepares new fortifications as Russian tank elite approachesBut greater risk looms for the Ukrainians. 90th Tank Division: Russia’s largest armored force redeploys south90th Tank Division specifications:25,000 personnel – Russia’s largest divisionHundreds of modern T-90M tanksRecently redeployed from northern to southern sectorElite status within Russian armored forcesThe recent redeployment of the 90th Tank Division could prove pivotal.