Boris Grekov
...that Boris Grekov was a Soviet historian who set out to debunk Mikhail Grushevsky's theory that Kievan Rus was a predecessor state of Ukraine rather than of Russia and Belarus?
...that <b id="mwCeQ"><a href="./Boris_Grekov" id="mwCeU" rel="mw:WikiLink" title="Boris Grekov">Boris Grekov</a></b> was a <a class="mw-redirect" href="./Soviet" id="mwCeY" rel="mw:WikiLink" title="Soviet">Soviet</a> historian who set out to debunk <a class="mw-redirect" href="./Mikhail_Grushevsky" id="mwCec" rel="mw:WikiLink" title="Mikhail Grushevsky">Mikhail Grushevsky</a>'s theory that <a class="mw-redirect" href="./Kievan_Rus" id="mwCeg" rel="mw:WikiLink" title="Kievan Rus">Kievan Rus</a> was a predecessor state of <a href="./Ukraine" id="mwCek" rel="mw:WikiLink" title="Ukraine">Ukraine</a> rather than of <a href="./Russia" id="mwCeo" rel="mw:WikiLink" title="Russia">Russia</a> and <a href="./Belarus" id="mwCes" rel="mw:WikiLink" title="Belarus">Belarus</a>?