The following is the Feb. 8, 2018, Congressional Research Service report, Russian Compliance with the Intermediate Range Nuclear Forces (INF) Treaty: Background and Issues for Congress.
From the report
The United States and Soviet Union signed the Intermediate-Range Nuclear Forces (INF) Treaty in December 1987. Negotiations on this treaty were the result of a “dual-track” decision taken by NATO in 1979 in response to concerns about the Soviet Union’s deployment of new intermediate-range nuclear...