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On dry grass, edge of pine wood. Size 3.5 to 4mm.

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I think yes, female of Geomyza hackmani/balachowskyi.
Well, even in cold Russia field season start?!!
Nikita

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Thanks Nikita - well I've learned Opomyzidae are among the latest flies in autumn, now it looks like they're among the earliest ones to find in spring.

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I agree with Nikita, a female of Geomyza hackmani or G. balachowskyi. It looks more like G. hackmani to me, but is impossible to be sure by just looking at the picture.
And yes, Opomyzidae can indeed be active from very early in the year untill very late in the year. For example a pair of G. breviseta were found in copula in mid-February. I have to admit though that I often don't collect Opomyzidae before early May.

Jan Willem

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Many thanks for your comment Jan Willem.