Heads of state
Argentina Mauricio Macri, President of Argentina
Saudi Arabia Salman, King of Saudi Arabia
United Arab Emirates Khalifa bin Zayed Al Nahyan, President of the United Arab Emirates and Emir of Abu Dhabi
Ukraine Petro Poroshenko, President of Ukraine
Former heads of state
Qatar Hamad bin Khalifa Al Thani, former Emir of Qatar
Sudan Ahmed al-Mirghani, former President of Sudan
Heads of government
Iceland Sigmundur Davíð Gunnlaugsson, Prime Minister of Iceland (resigned April 5, 2016)
Former heads of government
Georgia (country) Bidzina Ivanishvili, former Prime Minister of Georgia
Iraq Ayad Allawi, former Acting Prime Minister of Iraq
Jordan Ali Abu al-Ragheb, former Prime Minister of Jordan
Qatar Hamad bin Jassim bin Jaber Al Thani, former Prime Minister of Qatar
Ukraine Pavlo Lazarenko, former Prime Minister of Ukraine
Moldova Ion Sturza, former Prime Minister of Moldova
Much more at the link 
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