WASHINGTON, Jumada II 22, 1437, March 31, 2016, SPA -- U.S. Vice President Joe Biden and Ukrainian President Petro Poroshenko, who is visiting Washington to take part in a nuclear summit, will meet on Thursday, the White House said, according to Reuters. Biden and Poroshenko will hold a working lunch, the White House said in a statement on Wednesday. President Barack Obama will convene leaders from more than 50 countries in Washington this week for his fourth and final Nuclear Security Summit. --SPA 02:56 LOCAL TIME 23:56 GMT www.spa.gov.sa/w