In the post-communist countries with the fall of communism, Atari 2600 clones appeared, called Rambo, and were popular until the famiclons were released.I found some information about the official distribution.
Poland
The Atari distributor in Poland-Karen decided to release a clone called CA-160 through the California Access brand. Sold in Pewex stores in 1990-1991 did not gain much popularity. In 1992, the Atari distributor in Poland was JTT Computer which released the original Atari 2600.
Hungary
From 1991, Novotrade 2C was a distributor of Atari 2600.
Czech Republic and Slovakia
This article states that the console appeared in the late 1980s. https://sk.wikipedia.org/wiki/Atari_2600
Yugoslavia
In the 1980s, Mladinska Knjiga dealt with the distribution of Atari computers. I don't know if they also distributed consoles, but I found a 1988 article describing Atari 2600.
Slovenia
Mladinska Knjiga was still an Atari distributor and released Jaguar. And again I do not know if they also sold Atari 2600.
Romania
In some consignment stores it was possible to buy games for Atari 2600. I do not know if also consoles.
USSR
In the Soviet Union, there were small clubs where it was possible to play the Atari 2600. Unfortunately, there were very, very few of them and most of the owners had consoles probably bought abroad, so in the USSR most likely these consoles were not distributed.