Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Russian, Ukrainian Leaders Remember Chernobyl Accident VOA News April 26, 2011 A veteran "liquidator" at the Chernobyl nuclear reactor places flowers during a ceremony to honor victims of the Chernobyl disaster, in Krasnoyarsk, April 26, 2011 Photo: Reuters A veteran "liquidator" at the Chernobyl nuclear reactor places flowers during a ceremony to honor victims of the Chernobyl disaster, in Krasnoyarsk, April 26, 2011 Ukraine is marking the 25th anniversary of the deadly explosion at the Chernobyl nuclear power plant, which led to the worst nuclear disaster in history. As Japan struggles with its own nuclear crisis at the tsunami-damaged Fukushima nuclear plant, Ukrainian President Viktor Yanukovych said in a statement that no nation can overcome the consequences of such a catastrophe on its own. Commemoration of the Chernobyl disaster began in the middle of the night in the Ukrainian capital, Kyiv, when Russian Orthodox Patriarch Kirill struck a bell at the exact moment of the Chernobyl blast on April 26, 1986. The initial explosion killed two people, and radiation exposure killed 30 others in the following months. At the time Ukraine was part of the former Soviet Union,and authorities in Moscow waited three days to report the accident to the world, acting only after Swedish officials recorded unusually high radiation levels at a monitoring station. The Chernobyl blast released 400 times more radiation than the atomic bomb dropped on Hiroshima in 1945. It sent a cloud of radioactive fallout into Russia, Belarus and over a large portion of Europe. The World Health Organization believes that around 4,000 people eventually could die because of the accident. Russian President Dmitry Medvedev on Tuesday said Russia will put forward a plan to step up security at nuclear plants at the Group of Eight summit in May. Medvedev is expected to join Mr. Yanukovych and Kirill at Chernobyl later Tuesday to remember the victims. The disaster fueled a non-stop global debate about the safety of nuclear energy as a power source - a debate that has gotten hotter since last month's earthquake damaged the Japanese plant. The 1986 disaster has left a 30-kilometer area around the Chernobyl plant mainly uninhabitable, while environmentalists say fields in the surrounding area and the products grown there are still not safe and could pose a threat to human health. .