FYI, the main actress, Valeriya Nemchenko, is a fully-fledged Russian porn-star (and by no means underage when she did those movies). Being slim, pretty and youthful looking she did a pretty good job portraying a 14 yo girl which greatly contributed to the notoriety of these films.
Before anyone asks: AFAIK Russian Lolita only ever had a softcore version. The actress herself, however, has many hardcore scenes under her belt, some of which can easily be uncovered by a little typing in Google's search box

.