<a href="https://en.wikipedia.org/wiki/President_of_the_United_States" id="mwrA" rel="mw:WikiLink" title="President of the United States">U.S.</a> president <a href="https://en.wikipedia.org/wiki/Richard_Nixon" id="mwrQ" rel="mw:WikiLink" title="Richard Nixon">Richard Nixon</a> visits the <a href="https://en.wikipedia.org/wiki/Soviet_Union" id="mwrg" rel="mw:WikiLink" title="Soviet Union">Soviet Union</a>.