Subspecies of the Eurasian Buzzard fall in two groups: the western European and the eastern European group.
Countries like Romania have both the western subspecies Buteo buteo buteo and the eastern subspecies Buteo buteo vulpinus.
Both subspecies are not easy to tell apart because both subspecies shows many different plumage variations.
Consequently, only the most typical individuals can be identified.
The tail of B.b. vulpinus is usually paler than the nominate form, and often quite rufous.
The upper wings of B.b. vulpinus have pale primary patches, and the primary flight feathers are also paler when viewed from below.
Adults have a black trailing edge to the wings, and both morphs (rufous and grey) of B.b. vulpinus often have plain underparts, lacking the breast band frequently seen in B.b. buteo.
B.b. vulpinus is slightly smaller (45–50 cm), longer winged and longer tailed.

The bird on the first two photos generally looks like B.b. vulpinus but it seems to have a clear breast band indicating it is a B.b. buteo.
The bird on the 3rd and 4th photo looks more like B.b. vulpinus and the one on the 5th photo is hard to identify.

First 4 photos: Macin Mountains, Tulcea County, Romania, 22 May 2018
Last photo: Vadu area, Constanta County, Romania, 21 May 2018