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Hi Nikita,

Paul is right about it being a specimen of the genus Geomyza [Opomyzidae]. Unfortunately your picture is not the best for the identification. But let me make a guess:
- there seem to be one presutural and three postsutural dorsocentral setae.
- both crossveins seem to be clouded, but not as conspicuously as in the tripunctata group [G. majuscula, G. nartshukae, G. tripunctata]. However the clouds are to distinct for G. venusta.
- the colouration of the postnotum is not clearly visible, but it seems to be rather dark, but not entirely so. => probably not G. hackmani.
- the banded appearance of the abdomen reminds me strongly of the female of G. balachowskyi.

So my guess would be a female of Geomyza balachowskyi Mesnil, 1934. However to be sure you have to study sternite 8 (if it is indeed a female) or the sustylar lobe of the male genitalia (if it is a male).

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How to distinguish Opomyzidae from Pallopteridae in the field? The wings of Pallopteridae are much broader than those of the Opomyzidae (especially those of the genus Geomyza are rather narrow). Most Opomyzidae have no post vertical bristles (only present in the genus Anamalochaeta which only occurs in the most northern part of the holarctis). The post vertical bristles are present in Pallopteridae. Well this is not an easy character to use in the field I suppose. Generally speeking, the Pallopteridae look more like Tephritidae, which is certainly not the case with Opomyzidae!