Well, for starters:
Czechoslovakia:
“A period of political liberalization in 1968, known as the Prague Spring, was violently ended when the Soviet Union, assisted by some other Warsaw Pact countries, invaded Czechoslovakia”
Then there is Hungary:
“The Hungarian Revolution began on 23 October 1956 in Budapest when university students appealed to the civil populace to join them at the Hungarian Parliament Building to protest the USSR’s geopolitical domination of Hungary”
and
“Although initially willing to negotiate the withdrawal of the Soviet Army from Hungary, the USSR repressed the Hungarian Revolution on 4 November 1956, and fought the Hungarian revolutionaries until 10 November; repression of the Hungarian Uprising killed 2,500 Hungarians and 700 Soviet Army soldiers, and compelled 200,000 Hungarians to seek political refuge abroad”
Romania:
“August 1968, five Warsaw Pact nations (the Soviet Union, Bulgaria, Hungary, East Germany, and Poland) invaded Czechoslovakia in an effort to quell the reformist ideology of Alexander Dubček, the First Secretary of the Communist Party of Czechoslovakia.”
Then there is this little matter:
Ukraine:
“Since 2006, the Holodomor has been recognized by Ukraine[11] and 15 other countries as a genocide of the Ukrainian people carried out by the Soviet government.”
and
“Whether the Holodomor was genocide is still the subject of academic debate, as are the causes of the famine and intentionality of the deaths.[19][20][21] Some scholars believe that the famine was planned by Joseph Stalin to eliminate a Ukrainian independence movement.[10][22] Others suggest that the man-made famine was a consequence of Soviet industrialisation.”
Can you name any similar NATO invasions or atrocities?
These people who drone on and on about Russian history and Russian justification for their aggressiveness and Russian security concerns completely ignore history when it comes to the reason NATO exists in the first place. Western Europe has historical security concerns too.