In the 20th century, Russian was a mandatory language taught in the schools of the members of the old Warsaw Pact and in other communist countries that used to be Soviet satellites, including Poland, Bulgaria, the Czech Republic, Slovakia, Hungary, Albania, the former East Germany and Cuba. However, younger generations are usually not fluent in it because Russian is no longer mandatory in schools. According to the Eurobarometer 2005 survey, fluency in Russian remains fairly high, however, at (20–40%) in some countries, particularly those whose people speak a Slavic language and so have an edge in learning Russian (Poland, the Czech Republic, Slovakia, and Bulgaria).