I think modern Russian infantry shouldn't be too hard to convert to modern Ukranian infantry. They both have very similar equipment, weapons and webbing. I do believe the Ukrainians use a US style helmet and the Russians use a helmet with a different shape. I could be wrong. Of course the Ukraians ussually have their Blue and Yellow flag patch on the sleave. Another thing to consider is that the Ukranian forces fighting the "separatists" cough, cough, russians, wear a hodge podge of official Ukranian army gear and stuff from home or bought with their own money so you have a lot of room to work with. I think Zveda and Tak make nice modern Russians. Watch some Youtube videos about that conflict in Eastern Ukraine and you'll get a good idea of the different kits worn by the Ukranians. Good Luck