 In April 1987, Gorbachev discussed the issue with U.S. Secretary of State George P. Shultz in Moscow; he agreed to eliminate the Soviets' SS-23 rockets and allow U.S. inspectors to visit Soviet military facilities to ensure compliance.There was hostility to such compromises from the Soviet military, but following the May 1987 Mathias Rust incident—in which a West German teenager was able to fly undetected from Finland and land in Red Square—Gorbachev fired many senior military figures for incompetence.In December 1987, Gorbachev visited Washington D.C., where he and Reagan signed the Intermediate-Range Nuclear Forces Treaty.