Oh boy.
Do you want a perspective from "inside"? I live in a post Soviet country and i am russian-speaking.
First of all, all media (not just games) from CIS countries is rooted in a completely different culture and set of values. Another big difference is obviously diiferent history -- like 90s was pretty much the end of the world here, while "civilised world" was enjoying their SNES and Playstations.
The first thing to know about gaming in CIS countries: no consoles past pirated Famicom clones (see "
Grey elephant curse" to know the history of
Dendy), so no SNES, no N64. Genesis actually got relatively popular and Playstation 1 was common enough but majority of all gamers played on PC and that's what most games were developer for.
As to list of games from Eastern Europe... I am going to list them by genre so it's gonna be all over the place with years of release -- from early 2000s when i started gaming to this day.
RPGs:
Heroes of Might and Magic V and
King's Bounty series
HoMM series is really popular here. It got so popular HoMM 5 was even developed by Nival -- russian company. And King's Bounty IP which is technically a precursor HoMM series was even bought out by another russian company wholesale and they're doing new games in that series to this day.
I also tried to get into russian developed Disciples III, but couldn't figure it out. The only kind of RPGs i knew at the time were strategy RPG hybrids like HoMM and KB and i couldn't figure it out.
To this day, HoMM IV is the only RPG-game i managed to finish -- or at least finish one of the campaign. Since then i tried many other kinds of RPGs: W-, J-, S- but it all goes way too slow for me.
Simulator games:
General -- spent a LOT of time in this game. Playing this game with friends taking turns was especially fun (over LAN or in "hotseat" mode). It kinda looks primitive -- you are manipulating abstract numbers and filling bars but there is quite a lot of depth in there.
World of Tanks -- few of my colleagues were really into it. I actually only played 360 version for a little while and found it too shallow.
Space/flying sims:
Space Rangers 1 and 2
IL2-Sturmovik -- IL2 was one of the first game i got with my own money -- way back in 2001 or so. Also got a flying stick just to play this game. Then
I also know of
Star Wolves space sim series, but didn't personally played it myself.
I also vaguely remember trying to play game called
Parkan which was kind hybrid of mech game and space RTS or something...
Strategy:
Sudden strike -- a series of really cool early 2000s RTS. A cool feature of this series was complete absense of economics and resource management -- you don't build anything
I also remember
Paradise Cracked which was XCOM-style tactics game. Or more like "Jagged Alliance" type game, because "jaga" was REALLY popular at the time.
Point and click:
Pilot brothers -- Pilot brothers are cartoon characters and they made two (?) puzzle games based on them, with the same animation studio. Puzzles were complete BS. They re-released first game on mobile platforms recently.
Full Pipe -- yet another point and click game. It was animated by a celebreated animation artist and looks very,
very,
VERY weird and artsy. Also similar to Full Pipe is...
Samorost -- two point and click games from chech studio
Amanita design. I actually managed to finish first one but got stuck in the middle of the second...
What do those games have in common ?
What makes them different from other games ?
The big difference is as i said completely different background, like compare western first-person shooting game to STALKER or even Metro 2033 series (both sci-fi novel adaptations by the way). The difference in tone is gigantic -- everything is a lot more moody and post-apocalyptic.
Also a lot more emphasis on realism -- often to the detriment of playability.
Because most of japanese console gaming went past us (outside of a very few games) gamer here never really had an experience of a really polished console game like the ones on SNES and stuff. Maybe that's why games from here have so much "jank".
Quite a lot of Eastern European games have "realistic military" theme, especially if it's WWII-themed with games like World of Tanks, Sudden Strike,
Death to Spies, IL2-Sturmovik, WarThunder or even chech based Arma II.