Ukraine has requested Finland to donate old locomotives to UZ. Finland is sending a small amount, 10 units, of Dv12 locomotives, made in Finland a bit over half a century ago.
I'm almost sure the reason there's no spare parts is the licenses and not the manifacturing capabilities. Also it doesn't make much business sense to recreate manufacturing for such old tec. I'm quite sure it doesn't make sense in ukraine either but more likely they just use the spares to keep the current fleet going as the life expectancy of the locomotives doesn't necessarily need to be that long and they can't worry about pollution right now either. Mac gyvering some old parts to life for a year or so probably makes more sense there than in Finland.