Ukrainian comedian and presidential candidate Volodymyr Zelenskiy, center right, and his wife Olena Zelenska, center left, greet their supporters at his headquarters as the portrait of Ukrainian President Petro Poroshenko is seen on a TV screen, right, after the second round of presidential elections in Kiev, Ukraine, Sunday, April 21, 2019. Ukrainians voted on Sunday in a presidential runoff as the nation's incumbent leader struggles to fend off a strong challenge by a comedian who denounces corruption and plays the role of president in a TV sitcom. (AP Photo/Vadim Ghirda)