No, the map “Ukraine” definitely isn’t one of the standard maps: List of standard Heroes 3 maps. However, “Return to Avenge,” “Treasures of the Serpent,” and “Sinful Crusade” are standard. It is likely that you had a pirated build where the compiler added or changed something – this happens sometimes. Or perhaps someone simply added maps taken from elsewhere into the installed game.
Here, I found another “Ukraine” – probably the same one:
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