<a href="https://en.wikipedia.org/wiki/Cold_War" id="mwAQc" rel="mw:WikiLink" title="Cold War">Cold War</a>: In the <a href="https://en.wikipedia.org/wiki/Vienna_summit" id="mwAQg" rel="mw:WikiLink" title="Vienna summit">Vienna summit</a>, the <a href="https://en.wikipedia.org/wiki/Soviet_Union" id="mwAQk" rel="mw:WikiLink" title="Soviet Union">Soviet</a> premier <a href="https://en.wikipedia.org/wiki/Nikita_Khrushchev" id="mwAQo" rel="mw:WikiLink" title="Nikita Khrushchev">Nikita Khrushchev</a> sparks the <a href="https://en.wikipedia.org/wiki/Berlin_Crisis_of_1961" id="mwAQs" rel="mw:WikiLink" title="Berlin Crisis of 1961">Berlin Crisis</a> by threatening to sign a separate peace treaty with <a href="https://en.wikipedia.org/wiki/East_Germany" id="mwAQw" rel="mw:WikiLink" title="East Germany">East Germany</a> and ending American, British and French access to <a href="https://en.wikipedia.org/wiki/East_Berlin" id="mwAQ0" rel="mw:WikiLink" title="East Berlin">East Berlin</a>.