Eleven subspecies of the White Wagtail (Motacilla alba) are currently recognised and they all have slightly different plumages.
This is Motacilla alba alba, the nominate subspecies of the White Wagtail which occurs on the European continent and migrates down as far as Kenya.

1st & 2nd photo: Juta area, Caucasus Mountains, Georgia, 4 May 2024
3rd photo: Kazbegi, Caucasus Mountains, Georgia, 3 May 2024
4th & 5th photo: Ananuri Fortress area, Dusheti, Georgia, 2 May 2024