The strong opposition to Ceaușescu on all forms of "perestroika" and "glasnost" placed Ceaușescu at odds with Mikhail Gorbachev. He was very displeased when other Warsaw Pact countries decided to try their own versions of Gorbachev's reforms. In particular, he was incensed when Poland's leaders opted for a power-sharing arrangement with the Solidarity trade union. He even went as far as to call for a Warsaw Pact invasion of Poland—a significant reversal, considering how violently he opposed the invasion of Czechoslovakia 20 years earlier. For his part, Gorbachev made no secret of his distaste for Ceaușescu, whom he called "the Romanian führer." At a meeting between the two, Gorbachev upbraided Ceaușescu for his inflexible attitude. "You are running a dictatorship here," the Soviet leader warned.