Originally Posted by ZWK_Operator
Hi,
...
Known users at least as of 1990 GdR, Czechoslovakian Republic.
Anyone being able to check and add the missing details?
...


From russian source:

S-300PMU was exported to East Germany (1 battalion, 1989), Bulgaria (1 battalion, 1989), Czechoslovakia (1 battalion, 1990) and China (4 battalions, 1993).

Missiles exported up to first half of 1990s:
East Germany - 72 5V55K, also ordered 22 5V55R but not clear if delivered
Bulgaria - 16 5V55K and 20 5V55R
Czechoslovakia - 24 5V55R plus another 24 delivered to Slovakia in 1994
China - 196 5V55R, possibly also 86 older 5V55K