The Chernobyl nuclear power plant, where Ukraine accused Russia of striking a radiation containment structure, is a defunct facility in Ukraine which was the site of the world's worst civil nuclear catastrophe in April 1986.

The outer shell that was struck is a protective cover built in 2016 over a heavy concrete containment structure. Soon after the 1986 disaster, the inner layer (in which there was no indication of a breach on Friday morning), was placed on the plant’s fourth reactor. The containment shells seek to prevent radiation leaks.

Last night, a Russian attack drone with a high-explosive warhead struck the shelter protecting the world from radiation at the destroyed 4th power unit of the Chornobyl Nuclear Power Plant. This shelter was built by Ukraine together with other countries of Europe and the world,… pic.twitter.com/mLTGeDYgPT