<div class='node-body'><p>CHERNOBYL, Ukraine &mdash; The head of the UN warned on a landmark visit to Chernobyl on Wednesday that the Ukrainian tragedy and the recent accident in Japan prompted &quot;painful questions&quot; about the future of atomic power.</p>
<p>United Nations chief Ban Ki-moon visited the site of the Chernobyl disaster a day after world donors pledged 550 million euros ($800 million) towards a permanent shelter to secure the ruined reactor, which exploded on April 26, 1986.</p></div><div class="field field-type-filefield field-field-news-hp-image">
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