The <a href="https://en.wikipedia.org/wiki/Treaty_of_Saint_Petersburg_(1875)" id="mwkw" rel="mw:WikiLink" title="Treaty of Saint Petersburg (1875)">Treaty of Saint Petersburg</a> between Japan and Russia is ratified, providing for the exchange of <a href="https://en.wikipedia.org/wiki/Sakhalin" id="mwlA" rel="mw:WikiLink" title="Sakhalin">Sakhalin</a> for the <a href="https://en.wikipedia.org/wiki/Kuril_Islands" id="mwlQ" rel="mw:WikiLink" title="Kuril Islands">Kuril Islands</a>.