Tachanka Weather Vane
This easter egg can be found on the map, Fortress which released as part of Operation Wind Bastion.
On the roof of the Fortress, players can find a slowly spinning weather vane that looks like Tachanka while using his machine gun turret.
This easter egg is located on the north-eastern tower on the roof of Fortress and can be seen from both the ground near the front gate, and while on the roof as it is fairly large. It it unfortunately impossible to rappel up to the easter egg as the roof was designed with overhangs.