A memorial service at the Czech Radio building on Prague’s Vinohradská St. on Sunday morning commemorated the 48th invasion of Czechoslovakia by Soviet-led Warsaw Pact troops. The then Czechoslovak Radio building saw some of the bloodiest clashes after tanks rolled into the country on the night of August 20 and 21 1968 to quell the Prague Spring reform movement. Among the speakers at Sunday’s ceremony was MP Karel Schwarzenberg, who said it was not only important to honour the fallen heroes of that time – it was necessary to fight for the freedom of speech in all eras. Other participants included the ministers of human rights and culture, Jiří Dienstbier and Daniel Herman. Mr. Dienstbier said Russia today was pursuing a policy of limiting the sovereignty of other states and that the 1968 invasion showed that the best route for a country like the Czech Republic was cooperation within Europe.