Complete the following sentence: It joined the Warsaw Pact on May 14, 1955 and activities in the alliance include the
Invasion of Czechoslovakia. As early as May 1968, the BNA's Main Political Directorate launched a propaganda campaign to explain to the army the events in Czechoslovakia.<unk> As early as May 1968, the BNA's Main Political Directorate launched a propaganda campaign to explain to the army the events in Czechoslovakia. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ Military and ideological preparations ended on August 20, when the Council of Ministers decided that the country should take part in the intervention in Czechoslovakia.