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On Feb. 19, 1987, after Warsaw had pledged to open a dialogue with the church, Reagan lifted U.S. sanctions. Four months later, Pope John Paul II was cheered by millions of his countrymen as he traveled across Poland demanding human rights and praising Solidarity. In July 1988, Gorbachev visited Warsaw and signaled Moscow's recognition that the government could not rule without Solidarity's cooperation. On April 5, 1989, the two sides signed agreements legalizing Solidarity and calling for open parliamentary elections in June. In December 1990, nine years after he was arrested and his labor union banned, Lech Walesa became President of Poland.