Cold War (1985–1991) reduced some strategic arms unilaterally. Fundamental to the dissolution of the Soviet Union, the Gorbachev policy initiatives of Restructuring ("Perestroika") and Openness ("Glasnost") had ripple effects throughout the Soviet world, including eventually making it impossible to reassert central control over Warsaw Pact member states without resorting to military force. On June 12, 1987, Reagan challenged Gorbachev to go further with his reforms and democratization by tearing down the Berlin Wall. In a speech at the Brandenburg Gate next to the wall, Reagan stated: While the aging communist European leaders kept their states in the grip of "normalization", Gorbachev's reformist policies
Mikhail Gorbachev Ministry of the Interior troops) killed 4 people. Archie Brown suggests that Gorbachev's response this time was better, condemning the rogue action, sending his condolences and suggesting that secession could take place if it went through the procedures outlined in the Soviet constitution. According to Gorbachev's aide, Shakhnazarov, Gorbachev was finally beginning to accept the inevitability of "losing" the Baltic republics, although he would try all political means to preserve the Union. Brown believes that this put him in "imminent danger" of being overthrown by hard-liners opposing secession. Gorbachev continued to work on drafting a new treaty of union which