The <a href="https://en.wikipedia.org/wiki/Soviet_Union" id="mwAW0" rel="mw:WikiLink" title="Soviet Union">Soviet Union</a> conducts its final above-ground <a href="https://en.wikipedia.org/wiki/1962_Soviet_nuclear_tests" id="mwAW4" rel="mw:WikiLink" title="1962 Soviet nuclear tests">nuclear weapon test</a>, in anticipation of the 1963 <a href="https://en.wikipedia.org/wiki/Partial_Nuclear_Test_Ban_Treaty" id="mwAW8" rel="mw:WikiLink" title="Partial Nuclear Test Ban Treaty">Partial Nuclear Test Ban Treaty</a>.