Sources please.
Sources?
https://mil.in.ua/en/news/russia-transferred-s-400-from-kaliningrad-to-rostov-bellingcat/
https://www.voanews.com/a/russia-moves-its-air-defense-system-from-kaliningrad-/7370633.html
Since Russia first launched its invasion of Ukraine, Moscow has been peeling military forces away from its bases in Northern Europe to plug gaps in its forces suffering high losses and battlefield setbacks against Ukrainian troops.
Of an original estimated 30,000 Russian troops that once faced the Baltic countries and southern Finland, as many as 80 percent of them have been diverted to Ukraine, according to three senior European defense officials in the region, leaving Russia with only a skeleton crew in what was once its densest concentration of military force facing NATO territory.
“The drawdown we’ve seen from this region in the past seven months is very significant,” said one senior Nordic defense official, who spoke on condition of anonymity to discuss sensitive military matters. “Russia had this ground force posture facing us for decades that is now effectively just gone.”