Zvezda is one of the myriad of injection molding companies that emerged in Eastern Europe after the Soviet block fell apart. At first, they used old, re-cycled molds from other companies such as Frog, etc, but now they are doing their own molding and, at least in this instance, doing it very well.
A couple of years ago, Italeri introduced a line of simplified 1/72 scale kits to be used in a war game that they designed. Now, included in this box is a sample card used in the game. While in Cyrillic and, at least to me, un-readable, it appears to show the unit's movement abilities and limitations. It would be interesting to see the entire game. The models for Zvezda's game are in 1/100 scale and are of the no-glue variety. They are not really snap fit, but rather pressure fit, as there are no locking mechanisms. However, their system works quite well.