Historical Incident Revisited In Retrospective Coverage

President Zelensky is expected to visit the Chernobyl power plant site in northern Ukraine. Strict security measures are in place due to the proximity of the Belarus border. The visit coincides with planned commemorations including moments of silence, exhibitions, and wreath-laying ceremonies in Kyiv and other locations. These events mark the anniversary of the nuclear disaster that caused tens of thousands of deaths. Multiple cities will observe moments of silence and host exhibitions to mark the anniversary. The commemoration also includes remembrance in Russia and other former Soviet republics. Hundreds of thousands of liquidators previously worked to mitigate the radioactive contamination in the area. Treat it as background context rather than a newly reported incident unless the source states a current new development.