What is the nuclear test ban treaty and why is Russia changing its position?

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Nuclear Test Ban


The CTBT is "a remarkably effective treaty, even though it hasn't come into force", said Matthew Harries, director of proliferation and nuclear policy at the RUSI think-tank in London. The treaty's verification regime includes an International Monitoring System (IMS) - a network of observation facilities around the world that are capable of detecting the sound of a nuclear explosion or the associated seismic activity or radioactive fallout.