Hungarian Prime Minister Viktor Orban attends a news conference in Budapest, Hungary, July 26, 2016. REUTERS/Lazslo Balogh/Files

Two king penguins and their chick stand in their enclosure in the zoo of Schoenbrunn in Vienna, Austria, September 21, 2016. Picture taken September 21, 2016. Tiergarten Schoenbrunn/Daniel Zupanc/Handout via REUTERS

Two king penguins and their chick stand in their enclosure in the zoo of Schoenbrunn in Vienna, Austria, September 21, 2016. Picture taken September 21, 2016. Tiergarten Schoenbrunn/Daniel Zupanc/Handout via REUTERS

Stephane Boujnah, CEO of stock market operator Euronext, poses during a photocall at the compagny headquarters in Courbevoie, France, May 4, 2016. REUTERS/Jacky Naegelen

FILE PHOTO - Gulbuddin Hekmatyar speaks to a Reuters correspondent in Tehran Febuary 5, 2002. REUTERS/Caren Firouz

A European Union flag is held in front of the Big Ben clock tower in Parliament Square during a 'March for Europe' demonstration against Britain's decision to leave the European Union, central London, Britain July 2, 2016. REUTERS/Paul Hackett/File Photo

Maintenance engineers work on top of a power generating wind turbine at Suzlon wind farm in Surajbari village, about 275 km west of Ahmedabad, December 14, 2009. REUTERS/Amit Dave/Files

Japan's Kimiko Date-Krumm rests on her racquet during a training session at Melbourne Park January 18, 2015. REUTERS/Issei Kato