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I'm not sure whether anyone has done a faunistic study of Ukrainian ephydrids, but neighbouring countries (Poland, Slovakia, Hungary and Romania) have Ephydra glauca, macellaria, murina, riparia and scholtzi (as well as Setacera aurata, breviventris, micans and trina). Perhaps Tadek or Cranefly can help further.
E.murina and riparia have occurred in large numbers in Crimea. (See Przhiboro and Shadrin, 2012 Mass occurrence of flies of the genus Ephydra (Diptera: Ephydridae) at the coastline zone of hypersaline coastal lagoons in the Eastern Crimea)