• Ukraine's President Petro Poroshenko lays flowers at a monument to the victims of the Chernobyl tragedy outside the nuclear power plant in Ukraine, Tuesday, April 26, 2016. Ukraine on Tuesday marked the 30th anniversary of the explosion at the Chernobyl nuclear plant, the world’s worst nuclear accident. (AP Photo/Sergei Chuzavkov)

    Ukraine marks 30 years since 1986 Chernobyl nuclear disaster

    KIEV, Ukraine (AP) — As Ukraine and Belarus on Tuesday marked the 30th anniversary of the Chernobyl nuclear accident with solemn words and an angry protest, some of the men who were sent to the site in the first chaotic and frightening days were gripped by painful memories.