Presidency of Ronald Reagan to forestall the possibility of an agreement between the United States and the Soviet Union. Nonetheless, both Gorbachev and Reagan agreed to continue arms control negotiations at the October 1986 Reykjavík Summit. At the summit, Gorbachev and Reagan closed in on an agreement to greatly reduce or eliminate the nuclear stockpiles of both the U.S. and the Soviet Union over a ten-year period, but the deal collapsed due to disagreements regarding SDI development. Reagan attacked Gorbachev in a 1987 speech delivered in West Berlin, but negotiations continued. Gorbachev and Reagan broke the impasse by agreeing to negotiate separate treaties on
Mikhail Gorbachev for five years. In July 2016, Gorbachev criticized the North Atlantic Treaty Organization amid escalating tensions between the military alliance and the Russian Federation. Gorbachev has accused NATO of preparing for a "hot" war against Russia, saying that "All the rhetoric in Warsaw just yells of a desire almost to declare war on Russia. They only talk about defence, but actually they are preparing for offensive operations." In June 2018, Gorbachev welcomed the 2018 Russia–United States summit between Vladimir Putin and Donald Trump in Helsinki, Finland. In October 2018, Gorbachev criticized President Donald Trump's threat to withdraw from the 1987