Pro-Russian Separatists in Donetsk

Pro-Russian Separatists in Donetsk

Alexander Ermochenko/Anadolu Agency via Getty Images

Pro-Russian separatists stand guard as dozens of Ukrainian prisoners are marched around Lenin Square, in Donetsk, on Aug. 24, 2014. The five months of unrest have sparked the worst standoff between Russia and its former Cold War foes in two decades and unleashed sanctions on both sides.