The Nuclear Threat Initiative’s2020 NTI Nuclear Security Index, released last week, finds that progress on the protection of nuclear materials and facilities has slowed significantly over the past two years, reversing a trend of substantial improvements between 2012 and 2018.

Published biennially since 2012, the NTI index assesses and tracks nuclear security conditions in countries around the globe, highlighting progress and trends over time. It is produced in cooperation with the Economist Intelligence Unit, the research and analysis division of the Economist Group media company.