 On August 25, 1968, he and seven other dissidents organized the now-famous demonstration in support of the Prague Spring in Red Square near the Moscow Kremlin.Delaunay and Pavel Litvinov held the famous banner with the words "ЗА ВАШУ И НАШУ СВОБОДУ" ("For your freedom and ours").Seven people were arrested, and in court, Delaunay stated that the five minutes of freedom on the square were worth the awaiting years in prison.