Chief of the U.N.'s International Atomic Energy Agency (IAEA) Rafael Mariano Grossi (2ndR), EU Commissioner for Economy and Productivity, Implementation and Simplification Valdis Dombrovskis (2ndL) and Ukraine's Prime Minister Yulia Svyrydenko (L) attend Ukraine Energy Coordination Group summit on the 40th anniversary of the explosion at the Chernobyl nuclear power plant, in Kyiv on April 26, 2026, amid the Russian invasion of Ukraine. Ukraine on April 26, 2026, marks the 40th anniversary of the explosion at the Chernobyl nuclear power plant. It comes four years into the Russian invasion that has put the plant once again under threat and raised risks of another radioactive catastrophe. The 1986 explosion at the Chernobyl nuclear power plant was the worst civilian nuclear disaster in history and changed global perceptions of nuclear energy. (Photo by Sergei SUPINSKY / AFP via Getty Images)