The United States and <a href="https://en.wikipedia.org/wiki/Soviet_Union" id="mwAQY" rel="mw:WikiLink" title="Soviet Union">Soviet Union</a> both sign the <a href="https://en.wikipedia.org/wiki/START_I" id="mwAQc" rel="mw:WikiLink" title="START I">START I</a> Strategic Arms Reduction Treaty, the first to reduce (with verification) both countries' stockpiles.