Rome's mayor Virginia Raggi gestures during a news conference in Rome, Italy June 20, 2016. REUTERS/Remo Casilli

Chinese Premier Li Keqiang sits during a meeting with former New York City Mayor Michael Bloomberg for a dialogue with U.S. business leaders at the Waldorf Astoria Hotel during the week of the United Nations General Assembly in Manhattan, New York, U.S., September 20, 2016. REUTERS/Andrew Kelly

Former Afghan Prime Minister Gulbuddin Hekmatyar speaks to a Reuters correspondent in Tehran Febuary 5, 2002. REUTERS/Caren Firouz (IRAN)

Congolese opposition supporters chant slogans as they destroy the billboard of President Joseph Kabila during a march to press the President to step down in the Democratic Republic of Congo's capital Kinshasa, September 19, 2016. REUTERS/Kenny Katombe

Iran's national flags are seen on a square in Tehran February 10, 2012, a day before the anniversary of the Islamic Revolution. REUTERS/Morteza Nikoubazl

Men carry children away from a damaged site after airstrikes on the rebel held al-Qaterji neighbourhood of Aleppo, Syria September 21, 2016. REUTERS/Abdalrhman Ismail

2016 Rio Olympics - Swimming - Preliminary - Women's 100m Freestyle - Heats - Olympic Aquatics Stadium - Rio de Janeiro, Brazil - 10/08/2016. Yusra Mardini (SYR) of Refugee Olympic Athletes competes. REUTERS/Dominic Ebenbichler

A man carries an injured girl after airstrikes on the rebel held al-Qaterji neighbourhood of Aleppo, Syria September 21, 2016. REUTERS/Abdalrhman Ismail