the Soviet Union annexed Western Ukraine
... that the Soviet Union annexed Western Ukraine in 1939 following the invasion of Poland and an ultimatum to Romania?
... that <b id="mwCoI"><a class="mw-redirect" href="./Soviet_annexation_of_Western_Ukraine,_1939-1940" id="mwCoM" rel="mw:WikiLink" title="Soviet annexation of Western Ukraine, 1939-1940">the Soviet Union annexed Western Ukraine</a></b> in 1939 following the <a class="mw-redirect" href="./Soviet_invasion_of_Poland_(1939)" id="mwCoQ" rel="mw:WikiLink" title="Soviet invasion of Poland (1939)">invasion of Poland</a> and an <a href="./Ultimatum" id="mwCoU" rel="mw:WikiLink" title="Ultimatum">ultimatum</a> to <a href="./Romania" id="mwCoY" rel="mw:WikiLink" title="Romania">Romania</a>?