The Steppe Grey Shrike (Lanius pallidirostris) is closely related to the Northern Grey Shrike (Lanius excubitor) and Iberian Grey Shrike (Lanius meridionalis). 
It was formerly considered a subspecies of the Iberian Grey Shrike and some authors and authorities now consider it as a subspecies of the Northern Grey Shrike.
I have taken the liberty to treat is as a full species.
The Steppe Gey Shrike is distinguished by the shape of its white wingspot which is larger (clearly visible on the 2nd photo) than in other grey shrikes (sub)species.

1st & 2nd photo: Muntasar, Dhofar Region, Oman, 7 & 8 February 2017
3rd & 4th photo: Qatbit area, Dhofar Region, Oman, 7 February 2017