26 April 1986 - Chernobyl disaster, 21. 8. 1968 - Invasion of the Warsaw Pact troops, 17. 11. - 29. 12. 1989 - The Velvet Revolution in Czechoslovakia

2022 - full scale invasion of Russia into Ukraine, Perestroika

21. 8. 1968 - Invasion of the Warsaw Pact troops, 1976 – The Plastic People of the Universe trial, 1. 1. 1977 - Declaration of Chart 77, 21. 8. 1988 – 17. 11. 1989 – Street demonstrations against the communist regime, 17. 11. - 29. 12. 1989 - The Velvet Revolution in Czechoslovakia

5. 1. - 21. 8. 1968 - The Prague Spring, 21. 8. 1968 - Invasion of the Warsaw Pact troops, 17. 11. - 29. 12. 1989 - The Velvet Revolution in Czechoslovakia

2014 - first invasion of Russia into Ukraine, 2022 - full scale invasion of Russia into Ukraine, The Revolution of Dignity (21.11. 2013 – 22.02. 2014)

Perestroika, First Nagorno-Karabakh War, Dissolution of the Soviet Union

Perestroika, First Nagorno-Karabakh War, Dissolution of the Soviet Union

Perestroika, Dissolution of the Soviet Union

Ukraine in 1990-s., The Repressions of the totalitarian regime in the 1970s in Ukraine, Perestroika, Ukraine in 1986–1991, 26 April 1986 - Chernobyl disaster and 5 more anniversaries