The <a href="https://en.wikipedia.org/wiki/Moscow–Washington_hotline" id="mw9g" rel="mw:WikiLink" title="Moscow–Washington hotline">Moscow–Washington hotline</a> between the leaders of the U.S. and the <a href="https://en.wikipedia.org/wiki/Soviet_Union" id="mw9w" rel="mw:WikiLink" title="Soviet Union">Soviet Union</a> goes into operation.