Question for those who may have some more insight, although I don't expect much:
What is openly known about the disposition of medium- to long-range GBAD in Belarus?
According to some news articles, two Russian S-400 / SA-21 battalions (?) were deployed to Belarus for "exercises" prior to the invasion. There are also reports suggesting that at least one unit is operating somewhere in (southern?) Belarus in support of the invasion.
Also -
https://www.reuters.com/world/europe...ts-2022-03-01/
Belarusian state media (belta.by, appears to be down right now) previously reported that Belarus and Russia had discussed additional deployments of Russian S-400s to the western part of the country.