Ukrainian President Volodymyr Zelenskiy, center, visits the abandoned city of Prypyat some 3 kilometers (1.86 miles) from Chernobyl in Prypyat , Ukraine, Wednesday, July 10, 2019. A structure built to confine radioactive dust from the nuclear reactor at the center of the 1986 Chernobyl disaster was formally unveiled on Wednesday.(Ukrainian Presidential Press Office via AP)