Albert de Jong
barabensis type adult, June 12 2007, Sverdlovsk oblast - SE Urals. Picture: Annika Forsten & Antero Lindholm.
Picture from Pervouralsk. Annika Forsten & Antero Lindholm took pictures of large gulls during breeding season in Pervouralsk and Ekateringburg, Sverdlovsk oblast, and northern part of Chelyabinsk oblast. All photos are from early June. Most of them looked like barabensis. See their website for more info.
Bird below: long and parallel bill, like in nominate cachinnans. Speckled iris. Calls included below picture.