The 1987 Intermediate Nuclear Forces Treaty between the United States and the Soviet Union eliminated an entire class of ground-launched missiles.
The treaty states: "...each Party shall eliminate its intermediate-range and shorter-range missiles, not have such systems thereafter, and carry out the other obligations set forth in this Treaty."
According to a report by the New York Times, Russia has operationally deployed one battalion equipped with the SSC-8 cruise missile. A 2015 Washington Free Beacon report noted that American intelligence officials assessed the missile's range as falling within the scope of weapons prohibited by the INF Treaty (any ground-launched system with a range between 300 and 3,400 miles).
The blog ArmsControlWonk has estimated the SSC-8's range to be between 2,000 and 2,500 kilometers (1,242 and 1,553 miles) based on the assumption it is a version of the SS-N-30A "Sizzler" cruise missile.
While it looks like the Russians could be holding onto some banned systems, the U.S. scrapped three systems falling under the INF Treaty.
1. The BGM-109G Gryphon cruise missile
Forget the name, this was really a ground-launched Tomahawk that was deployed by the Air Force. According to the website of the USAF Police Alumni Association, six wings of this missile were deployed to NATO in the 1980s. Designation-Systems.net noted that the BGM-109G had a range of 1,553 miles and carried a 200-kiloton W84 warhead.
2. The MGM-31A Pershing I and MGM-31B Pershing Ia ballistic missiles
The Pershing I packed one of the biggest punches of any American nuclear delivery system and could hit targets 740 miles away. With a W50 warhead and a yield of 400 kilotons (about 20 times that of the bomb used on Nagasaki), the Pershing Ia actually was too much bang for a tactical role, according to Designation-Systems.net.
The West Germans operated 72 Pershing 1a missiles, according to a 1987 New York Times report.
3. The MGM-31C Pershing II
According to GlobalSecurity.org, this missile had longer range (1,100 miles), and had a W85 warhead that had a yield of up to 50 kilotons. While only one-eighth as powerful as the warhead on the Pershing I and Pershing Ia, the Pershing II was quite accurate – and could ruin anyone's day.
According to the State Department's web site, all three of these systems were destroyed (with the exception of museum pieces) by the end of May, 1991.