US threatens to walk out of the INF treaty

The INF Treaty, signed 30 years ago between the US and the Soviet Union, banned nuclear and non-nuclear missiles with ranges of 500-5,500 kilometers. It led to the elimination of over 2,600 missiles and contributed to ending the Cold War. Recently, the US has accused Russia of violating the treaty by developing a new Ground Launched Cruise Missile.

What types of missiles were banned by the INF Treaty?

In what way did the INF Treaty contribute to the end of the Cold War?