The common wood pigeon, Columba palumbus (in Russian, vyakhir or vityuten). In short, a wild pigeon species.
The wood pigeon is a large bird in its own right: about 40–42 cm long, a wingspan of around 78 cm, weighing roughly 450 g. On top of that, resting wood pigeons often puff up their plumage and pull their head in, just as in the photo.
Meet the dignified woodland pigeon in fluffy-ball mode.