Azerbaijani President Ilham Aliyev (right) and European Commission President Ursula von der Leyen shake hands after signing a memorandum of understanding on increasing import of Azeri natural gas.
Turkmen President Gurbanguly Berdimuhamedov poses with an ancient Akhal-Teke breed three years old studhorse, Begkhan, that won an Inernational Annual Horse Beauty contest in Ashgabat on April 23, 2016.
Vladimir Putin shakes hands with Ukrainian President Petro Poroshenko before their meeting with European leaders on Ukraine's crisis, on Oct. 17, 2014 in Milan, Italy. (DANIEL DAL ZENNARO/AFP/Getty Images)
Chinese President Xi Jinping and Russian President Vladimir Putin at the West Lake State Guest House on Sept. 4, 2016 in Hangzhou, China. (Wang Zhou - Pool/Getty Images)