The <a href="https://en.wikipedia.org/wiki/Soviet_Union" id="mwvQ" rel="mw:WikiLink" title="Soviet Union">Soviet Union</a> detonates the <a href="https://en.wikipedia.org/wiki/Tsar_Bomba" id="mwvg" rel="mw:WikiLink" title="Tsar Bomba">Tsar Bomba</a>, the most powerful explosive device ever detonated.