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Certainly a Nuthatch but the white flanks should be rusty on the Eurasian, so it may be an eastern variant or another species. There are at least half a dozen species of similar Nuthatch in Asia but my books do not specifically cover Russia.
I think Eurasian Nuthatch (Sitta europea)
Lat: 53.93, Long: 99.91
Spotted on Jun 7, 2010 Submitted on Jun 7, 2010