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Hi Nikita and Louis,

This is indeed not Geomyza tripunctata, nor G. majuscula. But these two species are not the only two species with 2 darkened crossveins. Other species with 2 darkened crossveins are G. annae, G. balachowskyi, G. hackmani, G. martineki, and G. nartshukae.
The specimen of Nikita looks most like a female of G. hackmani. To make sure, you should have a look at sternite 8 (in most cases retracted). On the enclosed picture you see sternite 8 of the following species: 2) G. annae; 3) G. balachowskyi; 4) G. hackmani; 5) G. martineki.

Jan Willem