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Moscow region, 05 july, 5mm, on birch bark.

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In GB I waould call this Diaphorus

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Thank you David.
Nikita
P.S. I'll be back after inverstigation of collected fly.

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By the colour of the eyes, yes, but I cannot recall them being so heavily grey-dusted...

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I'm back with two conclusions:
1. This fly is Diaphorus both in GB and Russia.
2. This is male of Diaphorus oculatus - yellow halteres, black hairs on underwing squama, short hairs on ventral t1, yellow spots on 2,3 tergits. The only doubt - f are not all completly black, f3- black, f1 and f2 mostly black, but with yellow apical part.
Nikita

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Confirmed by Igor Grichanov as Diaphorus oculatus with small "?" after oculatus.