First of all, I want to say how happy I am to finally find this recipe. It took me so long to get here and I've been craving these for such a long time. In 2004, when I went back to Ukraine to visit, I looked everywhere for these buns and no one sold them.
Finally I found out about this book that was written in 1940 by Plotnikov & Kolesnikov (Плотников П.М., Колесников М.Ф. - 350 сортов хлебо-булочных издели), and it had a recipe for these babies. The recipe is much easier to make than it looks, just time consuming, because you have to wait for the dough to rise so many times. These are just heavenly. I don't care that the process takes a huge part of my day, I will continue making them over and over again! :)
I love Kitchen Aid Mixer, its so helpful to knead the dough.
You can see a video tutorial for this recipe but its in Russian.