T-14 Armata tank makes debut in Ukraine.

TL;DR
Russia has reportedly begun using its new T-14 Armata battle tanks to fire on Ukrainian positions, but they have not yet participated in direct assault operations. The tanks have been fitted with extra protection on their flanks and crews have undergone "combat coordination" at training grounds in Ukraine. The T-14 tank has an unmanned turret, with crew remotely controlling the armaments from "an isolated armoured capsule located in the front of the hull." The tanks have a maximum speed on the highway of 80 kilometres (50 miles) per hour.
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