Bielecki's economic program proved to be tremendously controversial, particularly among Solidarity activists and politicians m. In May 1991, nearly 10,000 protesters converged in Warsaw to voice dissent against the government's radical economic reforms. Simultaneously, Solidarity organized strikes in various parts of the country. Diplomatically, Bielecki's government continued the push away from the Eastern Bloc and towards a stronger alliance with the West. In February 1991, negotiations with the Soviet Union began the withdrawal of over 50,000 troops from Poland and a military dismantling of the Warsaw Pact. Under Bielecki, Poland voted to dissolve Comecon (Council for Mutual Economic Assistance) and the Warsaw Pact, whose organizations officially disbanded between June and July 1991. Negotiations with Belgium, France, Germany, Luxembourg and the Netherlands successfully lifted visa restrictions against Polish citizens. In June, Bielecki, along with his German counterpart, the German Chancellor Helmut Kohl, signed the Treaty of Good Neighbourship between Poland and Germany, reaffirming the German-Polish Border Treaty and the Oder–Neisse line as the border between both nations. In November, following the conclusion of negotiations, Poland was invited to join the Council of Europe (CoE). Bielecki's government additionally led negotiations to sign an interim agreement with the European Coal and Steel Community (ECSC) and the European Economic Community (EEC) on trade, though its completion would occur until after the Bielecki government had collapsed.