KIEV REGION, UKRAINE - APRIL 26, 2017: The president of Ukraine, Petro Poroshenko (L), and the president of Belarus, Alexander Lukashenko, near the new confinement arch (sarcophagus) over Reactor 4 of the Chernobyl Nuclear Power Plant in the town of Chernobyl in the Chernobyl Exclusion Zone, during a ceremony marking the 31st anniversary of the Chernobyl nuclear disaster. Mykola Lazarenko/Press Office of the President of Ukraine/TASS (Photo by Mykola Lazarenko\TASS via Getty Images)
