Ukraine's presidential candidates hold debate ahead of election runoff

Ukraine's incumbent President and presidential candidate Petro Poroshenko (L) and presidential candidate and actor Volodymyr Zelensky shake hands before a debate at the Olympic stadium in Kiev, Ukraine, April 19, 2019. Petro Poroshenko and Volodymyr Zelensky on Friday held a debate ahead of the second round of the country's presidential election. (Xinhua/Sergey)