 Complete the following phrase:  Between 1969 and 1976, Kazakov officiated 12 matches in the European Cup, UEFA Cup and UEFA Cup Winners Cup. He officiated the second leg of the 1973 UEFA Cup Final between Liverpool and Borussia Mönchengladbach. Kazakov officiated at the 1972 Summer Olympics. He was the main referee for the match between Denmark and Brazil, and was an assistant referee in four other fixtures at the Games. He officiated two matches at the 1974 FIFA World Cup: the group stage match between Argentina and Italy, and the group stage match between West Germany and Sweden. In an interview, Kazakov said that he was considered as a referee for the 