Marshall Islands President Hilda Heine addresses the 73rd session of the United Nations General Assembly at U.N. headquarters in New York, U.S., September 25, 2018.

Former speaker of Singapore's parliament, Halimah Yacob, arrives at the Elections Department after she was given the certificate of eligibility to contest the election by the Presidential Elections Committee in Singapore September 11, 2017.

Nepal's newly elected President Bidhya Bhandari (C) walks out from the parliament after she was elected to power in Kathmandu, Nepal October 28, 2015. Bhandari is Nepal's first woman president.

Iceland's Prime Minister Katrin Jakobsdottir arrives at a European Union leaders summit in Brussels, Belgium March 22, 2019.

President of Croatia Kolinda Grabar-Kitarovic arrives to the Arraiolos Group meeting at Rundale Palace, Latvia, September 13, 2018.

Finland's Prime Minister Sanna Marin, in office since December 10, 2019. Lehtikuva/Heikki Saukkomaa via REUTERS

Taiwan's President Tsai Ing-wen visits the 6th Army Command, ahead of Lunar New Year, in Taoyuan, Taiwan January 25, 2019.

Prime Minister of Namibia Saara Kuugongelwa Amadhila speaks during the COP24 UN Climate Change Conference 2018 in Katowice, Poland December 3, 2018.

German Chancellor Angela Merkel, a top candidate of the Christian Democratic Union Party (CDU) for the upcoming general elections reacts at the final election rally in Munich, Germany September 22, 2017.

Barbados Prime Minister Mia Mottley arrives to address the 73rd session of the United Nations General Assembly at the U.N. headquarters in New York, U.S., September 28, 2018.

Estonian President Kersti Kaljulaid speaks during an interview in Tallinn, Estonia January 22, 2019.

Newly elected Slovakia's President Zuzana Caputova attends a televised debate in Bratislava, Slovakia, March 31, 2019.

New Zealand's Prime Minister Jacinda Ardern speaks at the Istana in Singapore, May 17, 2019.

Ana Brnabic Prime Minister of Serbia attends a news conference after the Strategic Dialogue of the Western Balkans meeting at the World Economic Forum (WEF) in Cologny near Geneva, Switzerland, October 2, 2018.

A police officer stands guard at the venue of the Commonwealth Heads of Government Meeting in Port-of-Spain November 26, 2009.

Newly elected President Sahle-Work Zewde addresses the House of Peoples' Representatives in Addis Ababa, Ethiopia October 25, 2018.

Norway's Prime Minister Erna Solberg delivers a speech during a session of the International Arctic Forum in Saint Petersburg, Russia April 9, 2019.

Bangladeshi Prime Minister, Sheikh Hasina speaks during an interview at Grand Hyatt Hotel in Manhattan, New York, U.S. September 25, 2018.

Georgia's president-elect Salome Zurabishvili speaks during an interview with Reuters in Tbilisi, Georgia, December 1, 2018.

Bolivia's interim President Jeanine Anez is seen during a ceremony at the presidential palace in La Paz, Bolivia, November 29, 2019.

Myanmar State Counselor Aung San Suu Kyi delivers a speech to the nation over Rakhine and Rohingya situation, in Naypyitaw, Myanmar September 19, 2017.

Belgium's Prime Minister Sophie Wilmes arrives to attend the U.N. climate change conference (COP25) in Madrid, Spain, December 2, 2019.

Austrian Chancellor Brigitte Bierlein talks to the media at the European Union leaders summit in Brussels, Belgium, June 21, 2019.

Denmark's Prime Minister Mette Frederiksen, in office since June 27, 2019. Ritzau Scanpix/Claus Bech via REUTERS