Western nations Saturday mounted pressure on Russia, blaming its leader and the government for the death of leading Kremlin critic Alexei Navalny in an Arctic prison in opaque circumstances. Navalny’s death was announced on Friday after three years in detention and a poisoning that he blamed on the Kremlin. It deprives Russia’s opposition of its figurehead just a month before an election poised to extend President Vladimir Putin’s hold on power and comes at a time of intense repression and as Moscow’s campaign in Ukraine nears its two-year anniversary. The West blamed Putin and his government …