BERLIN—German Chancellor Angela Merkel called on Russia to investigate an attack on opposition figure Alexei Navalny after German doctors determined on Monday that he had been poisoned with a toxic nerve agent, heightening tension between Moscow and the West. The exact circumstances surrounding the poisoning of Mr. Navalny remain a mystery, but the politician, who has challenged the Kremlin elite for more than a decade, had no shortage of enemies.

Source: Wall Street Journal August 24, 2020 14:14 UTC