Had my first experience at a Russian supermarket today.
Milk and cereal were the two must have items. While there I figured I would grab a dinner item or two and some snacks. The nearest supermarket is about a 5-8 minute walk north. Other than being located in a mall, this particular market is much like your traditional US supermarket. The variety of goods is there, however, quantity is not. You can get green beans but you do not have choices between 6 brands; you can get meat but the case is not full of different sizes/quantities — you pick from what is there. There is lots of fish, some vegetables/fruits, many cakes and milk products. Speaking of milk… I ended up with some yogurt (non-sweetened) drink that was by no means milk. Kiefer, it is called, was super nasty. 337 rubels later I had what I needed and was headed home.