Thanks to Igor Karyakin we have now pulications of the Raptors Conservation bulletin. These articles are dedicated to Short-toed Eagles or include mentions of them. The whole collection is divided into two PDFs by geographical regions:
• RAPTORS CONSERVATION. 2005-2008 – Collection of articles with mentions of Short-toed Eagle in Kazakhstan – 
(Ru)(En) – 4.8 MB {rough translation}.
• RAPTORS CONSERVATION. 2005-2009 – Collection of articles with mentions of Short-toed Eagle in Russia – (Ru)(En) – 14 MB {rough translation}.
Almost every article is bilingual, but some of them have English summary only, such as this one about Short-toed Eagle distribution in Nizhny Novgorod Region /map/:
• Бакка С.В., Киселёва Н.Ю., 2009 – Распространение и численность змееяда в Нижегородской области, Россия [Distribution and number of the Short-Toed Eagle in the N. Novgorod District (Region), Russia] // Пернатые хищники и их охрана – Raptors Conservation, 17. C. 121-124 (Ru).