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Swept near water in our town park.
Size of the first fly 2 mm.

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Size of the second fly 2.5 to 3 mm.

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Campsicnemus scambus, at least male. Early spring species, by the way.
Nikita

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Opening hunting season in Moscow. Petersburg pools are still covered with morning ice. I have identified a male taken in Naro-Fominsk in October. It is Campsicnemus lumbatus Loew, 1857: Progr.Realsch.Meseritz 1857: 28 ** Type locality: Poland: "aus hiesiger Gegend" [= Meseritz]. Palaearctic: Sweden, Germany, Austria, Netherlands, Belgium, France, Switzerland, Czech, Slovakia, Belarus, Poland, Hungary, Romania, Estonia, Russia, Ukraine *
It is the same as your first photo pair. It has somewhat unusual leg coloration. Have you caught them near petrol station?

The second pair is surely
Campsicnemus scambus (Fallen, 1823) [Dolichopus] (Haliday, 1851, in: Walker, Stainton & Wilkinson: Ins.brit. 1(1): 188) *
=Dolichopus scambus Fallen, 1823: Dipt.Svec. 2 (Monogr.Dolichopod.Svec.): 19 ** Type locality: Sweden: Esperod. Palaearctic: Norway, Denmark, Sweden, Finland, Ireland, England, Germany, Austria, Netherlands, Belgium, France, Switzerland, Hungary, Poland, Belarus, Bulgaria, Czech, Slovakia, Romania, Estonia, Lithuania, Russia, Ukraine * Campsicnemus

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Many thanks Igor. As regards that unusual coloration, there's a lot of pollution sources at our town park; undisciplined (to say the least of it) pedestrians mark their ways generously scattering food wrappings and empty bottles; some drivers prefer to wash their cars themselves near the river, so the traces of oil products can be found almost everywhere...