BRUSSELS—Imprisoned Russian opposition leader Alexei Navalny, who narrowly survived a poisoning that he blames on the Kremlin, was awarded the European Union’s top human rights prize Wednesday in a clear slap at President Vladimir Putin. In awarding the Sakharov Prize to Navalny, the European Parliament praised his “immense personal bravery.” The 45-year-old activist fell ill from a nerve agent poisoning last year and recuperated in Germany, then was promptly arrested upon his return to Moscow and later imprisoned. “He has campaigned consistently against the corruption of Vladimir Putin’s regime, and through his social media accounts and political campaigns, Navalny has helped expose abuses and mobilize the support of millions of people across Russia. For this, he was poisoned and thrown in jail,” parliament President David Sassoli in a statement. Sassoli called for the immediate release of Navalny, who is Putin’s biggest domestic foe. There was no immediate reaction to the …