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Hmm ... possibly Gonia picea, as Theo suggested - the red marks are very reduced. But that's just how I would identify it here in England - I am not sure what other strange and wonderful species you have in Moscow ;)

I went out yesterday to look for interesting tachinids but all I saw were Gymnocheata viridis - 100s of them all sitting on tree trunks and fence posts. They're a nice easy species to identify but it would have been good to see something a bit more exciting, like a Gonia or T.ursina. :(

Chris R.