The Russian tank with the most losses in Ukraine is the T-72B3 obr.2016. This is the most recent variant of the T-72 that the Russians use (and started producti

The Russian tank with the most losses in Ukraine is the T-72B3 obr.2016. This is the most recent variant of the T-72 that the Russians use (and started production in 2016) and has the same armour as the T-90MS which started production in 2017. The only more advanced tank Russia has is the T-14, but it likely has less then 20 of those and due to the sanctions wont be able to make anymore, so its unlikely to be fielded in Ukraine.