By 1968 reforms are sweeping through the lines of the Czechoslovak Communist Party and the previous hard-liner regime of Antonin Novotny.
In early 1968, the newly appointed Party leader Alexander Dubcek seeks to introduce a series of changes with the aim of consolidating power by popular consent. Under the slogan 'a socialism with a human face', he openly argues for free speech, travel and freedom of assembly.
In February, the same year, Leonid Brezniew, visits Prague to get a personal feel for Dubcek and his commitment to communism. On the surface they both agree that reforms are inevitable. Yet, the changes are increasingly perceived as threatening to the Communist world, and as the local newspapers publicly criticize the Soviet Union tensions rise in Moscow.
In the first moths of summer Warsaw Pact troops stage a military exercise in close proximity with the borders of Czechoslovakia. In an obvious display of the military capabilities of the Communist countries, all military signaling devices are left following the excersice.
In July the entire Russian Polit Bureau convenes with Dubcek. They explicitly demand, among other things, certain changes of personnel in public institutions and tighter control over the country's media. Dubcek is pressured into concessions. Regardless, Moscow has made up its mind- anti socialist forces are attacking the USSR and engaging in 'ideological manipulation' endangering the very cause of socialism. The crisis must be solved by other means in order to preserve the system and the balance of power between the east and west.
On 3rd of august, one moth after the bilateral meetings with Moscow, a common declaration is signed in Bratislava between six European socialist states. The members of the Warsaw Pact, reaffirm principles such as national sovereignty, territorial integrity, equality, independents and fraternal cooperation.
In the weeks to follow, Prague host official visits of several presidents including Marshal Josip Tito (Yugoslavia), Walter Ulbricht (East Germany), and Nicolae Ceausescu (Rumania). Czechoslovakia is referred to as the most stable of the socialist states.
As the Extraordinary Party Congress is preparing for its annual meeting, during which the ratification of the recent economic and social reforms were anticipated, Prague wakes up to unexpected news. The Special broadcast of the Czechoslovak Communist Party announces that on August 20, at 11.00 p.m., armed forces of the Soviet Union, the Polish Peoples Republic, the German Democratic Republic, the Hungarian Peoples Republic and the Bulgarian Peoples Republic, have crossed the border.
Shortly after midnight on Wednesday the 21 of August 1968, the airport comes under siege by paratroopers, giving the invading forces unlimited access to deliver military supplies and arms to their forces.
Soon thereafter a black Volga limousine transports the first detachment from the Russian embassy to the building of the Central Committee of the party, where Dubcek is presiding over a meeting with other party members.
President Dubcek, Chariman of the national assembly Slakovski, and Prime Minister Černík, are detained by armed soldiers and transported under the supervision of the Kymitet Gosydarstvenoi Bezopasnosti, better known as the KGB- the Soviet Secret Service.
Before their detention they manage to condemn the invasion…
In the early hours, Warsaw Pact troops enter Prague, the capitol of the Czechoslovak Socialist Republic. The morning newscast insists that this has happened without the previous knowledge of the President, the Chairmen and the First Secretary of the Communist Party.
By 08.00 a.m. the building of the central committee of the party is completely under siege. As the tanks get into position people start gathering inquisitively.
Armored vehicles also stop in front of the Central building of Radio Prague, the same building where in May 1945 national troops fought the Nazis for the right of free speech. People gather around the building. A sense of confusion rises as troops and Czechoslovak citizens engage in friendly conversations and discussions with the soldiers.
- Ivan go home Natasha is waiting for you…
The soldiers, mostly young boys are overcome by doubt about their role and purpose.
- How can we be occupiers, we are only carrying out orders?
- What did they tell you, why do you think you are here? There is no counter revolution!
- I am a soldier- what do I know.
Tanks are encircled, gently moving through a defiant sea of people. Crowds gather, as people take to the streets in protest. People climb on top of the armored vehicles waving flags while yelling 'Dubcek Svoboda' – Dubcek Freedom.
Sudden shots are fired and people take to the side streets as the radio building is taken over by the military.
Dubcek appears on a broadcast urges the people to refrain from any provocative acts, stay calm, not to from panic.
After 24 days the tanks withdraw. Moscow is in charge of Prague and Czechoslovakia, preserving the 'balance of power between the east and west'.