The <a href="https://en.wikipedia.org/wiki/Treaty_of_Berlin_(1926)" id="mwkg" rel="mw:WikiLink" title="Treaty of Berlin (1926)">Treaty of Berlin</a> is signed. Germany and the <a href="https://en.wikipedia.org/wiki/Soviet_Union" id="mwkw" rel="mw:WikiLink" title="Soviet Union">Soviet Union</a> each pledge neutrality in the event of an attack on the other by a third party for the next five years.