sentences:  The INF Treaty of December 1987, signed by Reagan and Gorbachev, eliminated all nuclear and conventional missiles, as well as their launchers, with ranges of 500–1,000 kilometres (310–620 mi) (short-range) and 1,000–5,500 kilometres (620–3,420 mi) (intermediate-range).The treaty did not cover sea-launched missiles of the sort Britain possessed.By May 1991, after on-site investigations by both sides, 2700 missiles had been destroyed.