The following is the Jan. 18, 2019 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. At that time, in response to concerns about the Soviet Union’s deployment of new...
https://news.usni.org/2019/01/21/report-congress-russian-compliance-inf-treaty