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I'd agree with Orange-crowned Warbler, subspecies celata ('taiga' in Sibley; as opposed to the local west-coast breeding lutescens), though that yellowish rump is odd (the yellowish under-tail coverts do fit). Slightly reminiscent of Virginia's Warbler, but that doesn't fit on other characters (e.g. has complete eye ring).
Otherwise, it looks very like a Chiffchaff (Phylloscopus collybita) from my side of things (it breeds as far east as about 145°E in eastern Siberia). But again, the yellowish rump is the sticking point. Of others from Siberia, Dusky and Radde's Warblers can be counted out, they both have much more prominent supercilia.
PS interesting website he has there - found one misident, though, [HYPERLINK@www.nawwal.org] labelled Picea sitchensis seed, is Tsuga heterophylla seed
