Russia's Yeltsin
I believe the answer is:
boris
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">russia's yeltsin</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for boris that I've seen before include "Pasternak, perhaps" , "Russian name" , "- Godunov, Mussorgsky opera" , "Leading Brexiteer's given name" , "-- Godunov; -- Johnson" .)