Soviet leader Mikhail Gorbachev says he will "attentively consider" a message from Pope John Paul II expressing concern about the treatment of Catholics in the Soviet Union and suggesting improved contacts between Moscow and the Vatican. Vatican Secretary of State Agostino Casaroli, in Moscow for celebrations marking 1,000 years of Christianity in Russia, met Gorbachev Monday and handed him the personal letter from the pope. "We shall attentively consider the message from the pope, including the question of giving a regular character to contacts between our states," the Tass news agency quoted Gorbachev as saying in the Kremlin meeting. "There exists the basis for a dialogue," Gorbachev said.