On 21 August 2013, the Soviet Army monument in Sofia was discovered to have been painted in pink, with the message "Bulgaria apologizes" in Bulgarian and Czech on display, a reference to the Bulgarian troops' participation in the 1968 Warsaw Pact invasion of Czechoslovakia. The Russian media voiced criticism and the police and judiciary vowed to investigate the matter. Soon thereafter, the Bulgaria – Russia Forum provided funds for the clean-up of the monument. A protester procession passed by the Czech embassy and the National Parliament, carrying a pink paper tank.