In the Telegraph (London), Czech-born British TV journalist John Tusa remembers forty years ago today, 21 August 1968, when the Warsaw Pact tanks rolled into Czechoslovakia and crushed the hopes raised by the Prague Spring.

Sir John has prepared a series of four excellent programs about 1968 —“The Year of Revolutions”— for the BBC. They can be listened to online. The third hour deals with the events in Prague.