Indonesia's Foreign Minister Retno Marsudi (R) and her Australian counterpart Julie Bishop address the media following their meeting in Jakarta, Indonesia March 21, 2016. REUTERS/Darren Whiteside

Indonesia's Foreign Minister Retno Marsudi (R) walks with her Australian counterpart Julie Bishop following their meeting in Jakarta, Indonesia March 21, 2016. REUTERS/Darren Whiteside

Indonesia's Foreign Minister Retno Marsudi (C) shares a laugh with her Australian counterpart Julie Bishop (L) before their meeting in Jakarta, Indonesia March 21, 2016. REUTERS/Darren Whiteside

U.S. President Barack Obama and his wife Michelle stand with U.S. ambassador to Cuba, Jeffrey DeLaurentis (L), as they meet with embassy staff in a hotel in Havana March 20, 2016. REUTERS/Carlos Barria 

U.S. President Barack Obama (C) waves as he and his wife Michelle walk into a room with the U.S. ambassador to Cuba, Jeffrey DeLaurentis (L), soon after the Obamas arrived in Cuba for a three-day trip, in Havana March 20, 2016. REUTERS/Carlos Barria 

Francis Lorenzo, former deputy U.N. ambassador from the Dominican Republic, exits the Manhattan U.S. District Courthouse in New York March 16, 2016. Francis Lorenzo pleaded guilty on Wednesday to charges that he participated in a scheme to bribe a former U.N. General Assembly president. REUTERS/Brendan McDermid TPX IMAGES OF THE DAY

German ambassador to Russia Ruediger von Fritsch lays flowers during a commemoration ceremony marking the first anniversary of opposition politician Boris Nemtsov's death at the site of his murder in central Moscow, Russia, February 28, 2016. REUTERS/Maxim Shemetov 

French ambassador to Russia Jean-Maurice Ripert lays flowers during a commemoration ceremony marking the first anniversary of opposition politician Boris Nemtsov's death at the site of his murder in central Moscow, Russia, February 28, 2016. REUTERS/Maxim Shemetov 

EU ambassador to Russia Vygaudas Usackas (L) and French ambassador to Russia Jean-Maurice Ripert (R) attend a flower-laying ceremony to mark the first anniversary of opposition politician Boris Nemtsov's death at the site of his murder in central Moscow, Russia, February 28, 2016. REUTERS/Maxim Shemetov 

Vygaudas Usackas (R), EU ambassador to Russia, lays flowers during a commemoration ceremony marking the first anniversary of opposition politician Boris Nemtsov's death at the site of his murder in central Moscow, Russia, February 28, 2016. REUTERS/Maxim Shemetov 

Vygaudas Usackas (front 2nd R), EU ambassador to Russia and accompanied by ambassadors of EU states, attends a flower-laying ceremony to mark the first anniversary of opposition politician Boris Nemtsov's death at the site of his murder in central Moscow, Russia, February 28, 2016. REUTERS/Maxim Shemetov TPX IMAGES OF THE DAY

Russia's ambassador, to Afghanistan Alexander Mantytskiy (L) hands over an AK-47 to Afghan national security adviser Hanif Atmar (R) after a conference at the International Kabul Airport, Afghanistan February 24, 2016. Afghan officials took delivery of 10,000 automatic rifles and millions of rounds of ammunition as a gift from Russia on Wednesday, another sign of deepening involvement by Moscow in the war-torn country. REUTERS/Mohammad Ismail

U.S. Secretary of State John Kerry is greeted by U.S. Ambassador to Laos Daniel Clune on his arrival in Vientiane, Laos January 24, 2016. REUTERS/Jacquelyn Martin/Pool 

Pope Francis (L) is greeted by an ambassador and during an audience with the diplomatic corps at the Vatican January 11, 2016. REUTERS/Alessandro Bianchi

Pope Francis (L) shakes hands with an ambassador during an audience with the diplomatic corps at the Vatican January 11, 2016. REUTERS/Alessandro Bianchi

Pope Francis (L) greets an ambassador and his wife during an audience with the diplomatic corps at the Vatican January 11, 2016. REUTERS/Alessandro Bianchi

Pope Francis makes his speech during an audience with the diplomatic corps at the Vatican January 11, 2016. REUTERS/Alessandro Bianchi

Pope Francis makes his speech during an audience with the diplomatic corps at the Vatican January 11, 2016. REUTERS/Alessandro Bianchi

Pope Francis poses with ambassadors during an audience with the diplomatic corps at the Vatican January 11, 2016. REUTERS/Alessandro Bianchi TPX IMAGES OF THE DAY

Nigeria's Minister of Solid Minerals Developments Kayode Fayemi meets with U.S. ambassador to Nigeria James F. Entwistle in Abuja, Nigeria January 7, 2016 REUTERS/Afolabi Sotunde 

Nigeria's Minister of Solid Minerals Developments Kayode Fayemi (L) meets with U.S. ambassador to Nigeria James F. Entwistle in Abuja, Nigeria January 7, 2016 REUTERS/Afolabi Sotunde 

U.S. ambassador to Nigeria James F. Entwistle meets with the Nigerian Minister of Solid Minerals Development Kayode Fayemi in Abuja, Nigeria January 7, 2016. REUTERS/Afolabi Sotunde 

U.S. ambassador to Nigeria James F. Entwistle is seen during a visit to the Nigerian Minister of Solid Minerals Development Kayode Fayemi in Abuja, Nigeria January 7, 2016. REUTERS/Afolabi Sotunde 

Ambassador Elbio Rosselli, Permanent Representative of Uruguay and President of the Security Council for the month of January, speaks at U.N. headquarters in New York, January 6, 2016. REUTERS/Brendan McDermid

Ambassador Elbio Rosselli, Permanent Representative of Uruguay and President of the Security Council for the month of January speaks at the U.N. headquarters in New York, January 6, 2016. The United Nations Security Council will begin working immediately on new measures to take in response to North Korea's fourth nuclear test, Uruguay's U.N. Ambassador Rosselli said on Wednesday. REUTERS/Brendan McDermid 

Ambassador Elbio Rosselli, Permanent Representative of Uruguay and President of the Security Council for the month of January speaks at the U.N. headquarters in New York, January 6, 2016. The United Nations Security Council will begin working immediately on new measures to take in response to North Korea's fourth nuclear test, Uruguay's U.N. Ambassador Rosselli said on Wednesday. REUTERS/Brendan McDermid

Japanese Ambassador to the United Nations Motohide Yoshikawa speaks at the U.N. headquarters in New York, January 6, 2016. The United Nations Security Council will begin working immediately on new measures to take in response to North Korea's fourth nuclear test, Uruguay's U.N. Ambassador Elbio Rosselli said on Wednesday. REUTERS/Brendan McDermid

Japanese Ambassador to the United Nations Motohide Yoshikawa speaks at the U.N. headquarters in New York, January 6, 2016. The United Nations Security Council will begin working immediately on new measures to take in response to North Korea's fourth nuclear test, Uruguay's U.N. Ambassador Elbio Rosselli said on Wednesday. REUTERS/Brendan McDermid

Ambassador Elbio Rosselli, Permanent Representative of Uruguay and President of the Security Council for the month of January speaks at the U.N. headquarters in New York, January 6, 2016. The United Nations Security Council will begin working immediately on new measures to take in response to North Korea's fourth nuclear test, Uruguay's U.N. Ambassador Rosselli said on Wednesday. REUTERS/Brendan McDermid

Ambassador Elbio Rosselli, Permanent Representative of Uruguay and President of the Security Council for the month of January speaks at the U.N. headquarters in New York, January 6, 2016. The United Nations Security Council will begin working immediately on new measures to take in response to North Korea's fourth nuclear test, Uruguay's U.N. Ambassador Rosselli said on Wednesday. REUTERS/Brendan McDermid

U.S. ambassador to France Jane Hartley (L) greets U.S. Secretary of State John Kerry upon his arrival at Le Bourget airport in the outskirts of Paris, France December 7, 2015. Kerry is due to attend the last phase of the World Climate Change Conference 2015 (COP21). REUTERS/Mandel Ngan/Pool 

U.S. ambassador to France Jane Hartley (L) greets U.S. Secretary of State John Kerry upon his arrival at Le Bourget airport in the outskirts of Paris, France December 7, 2015. Kerry is due to attend the last phase of the World Climate Change Conference 2015 (COP21). REUTERS/Mandel Ngan/Pool 

U.S. ambassador to France Jane Hartley (L) greets U.S. Secretary of State John Kerry upon his arrival at Le Bourget airport in the outskirts of Paris, France December 7, 2015. Kerry is due to attend the last phase of the World Climate Change Conference 2015 (COP21). REUTERS/Mandel Ngan/Pool 

U.S. Secretary of State John Kerry (R) talks with and U.S. Ambassador to NATO Douglas Lute during a NATO foreign ministers meeting at the Alliance's headquarters in Brussels, Belgium, December 2, 2015. REUTERS/Eric Vidal 

Lebanon's Prime Minister Tammam Salam gestures as he talks near Qatar's Ambassador to Lebanon Ali bin Hamad Al Marri (2nd L) after Lebanese soldiers and policemen who were captured by the al Qaeda-linked Nusra Front in Arsal arrive at Beirut, Lebanon December 1, 2015. Al Qaeda's Syrian wing, the Nusra Front, released 16 Lebanese soldiers and policemen held captive since August, 2014 on Tuesday in a Qatari-mediated deal that also secured freedom for a jailed ex-wife of Islamic State leader Abu Bakr al-Baghdadi. REUTERS/Mohamed Azakir 

Russian President Vladimir Putin (C) receives diplomatic credentials from Bahraini ambassador to Russia Ahmed Abdulrahman Mahmoud Ismail al-Saati during a ceremony at the Kremlin in Moscow, Russia, November 26, 2015. REUTERS/Sergei Ilnitsky/Pool 

Russian President Vladimir Putin (R) shakes hands with Israeli ambassador to Russia Zvi Heifetz during a ceremony of receiving diplomatic credentials from foreign ambassadors at the Kremlin in Moscow, Russia, November 26, 2015. REUTERS/Sergei Ilnitsky/Pool 

Russian President Vladimir Putin (R) receives diplomatic credentials from Israeli ambassador to Russia Zvi Heifetz, with Russian Foreign Minister Sergei Lavrov seen in the background, during a ceremony at the Kremlin in Moscow, Russia, November 26, 2015. REUTERS/Sergei Ilnitsky/Pool 

Russian President Vladimir Putin (R) receives diplomatic credentials from South Korean ambassador to Russia Park Ro-byug during a ceremony at the Kremlin in Moscow, Russia, November 26, 2015. REUTERS/Sergei Ilnitsky/Pool 

Russian President Vladimir Putin (R) receives diplomatic credentials from Irish ambassador to Russia Adrian McDaid during a ceremony at the Kremlin in Moscow, Russia, November 26, 2015. REUTERS/Sergei Ilnitsky/Pool 

Russia's President Vladimir Putin (R) shakes hands with Sweden's ambassador to Russia Peter Ericson during a ceremony of receiving diplomatic credentials from foreign ambassadors at the Kremlin in Moscow, Russia, November 26, 2015. REUTERS/Sergei Ilnitsky/Pool 

French Ambassador to China Maurice Gourdault-Montagne speaks during a memorial tribute to the victims of Friday's attacks in Paris, at the French Embassy in Beijing, China, November 16, 2015. REUTERS/Jason Lee 

French Ambassador to Japan Thierry Dana (2nd L), Japan's Chief Cabinet Secretary Yoshihide Suga (L) and Tokyo Governor Yoichi Masuzoe (3rd L) take a moment of silence to pay tribute to the victims of Paris attacks with French residents in Japan and French embassy staff at Dana's official residence in Tokyo, Japan, November 15, 2015. REUTERS/Yuya Shino 

U.S. Ambassador to the United Kingdom Matthew Barzun speaks during a reception at The U.S. Ambassador's London residence, Britain, November 4, 2015. The reception celebrated the launch of the Elton John AIDS Foundation and the U.S. President's Emergency Plan for AIDS Relief $10 million partnership to provide grants to organisations working to meet the HIV-related needs of Lesbian, Gay, Bisexual and Transgender people. REUTERS/Suzanne Plunkett 

U.S. Ambassador to the United Kingdom Matthew Barzun (L) holds a light from his mobile phone for singer Elton John as he speaks at a reception at The U.S. Ambassador's London residence, Britain, November 4, 2015. The reception celebrated the launch of the Elton John AIDS Foundation and the U.S. President's Emergency Plan for AIDS Relief $10 million partnership to provide grants to organisations working to meet the HIV-related needs of Lesbian, Gay, Bisexual and Transgender people. REUTERS/Suzanne Plunkett TPX IMAGES OF THE DAY

U.S. Ambassador to the United Kingdom Matthew Barzun (L) holds a light from his mobile phone for singer Elton John as he speaks at a reception at The U.S. Ambassador's London residence, Britain, November 4, 2015. The reception celebrated the launch of the Elton John AIDS Foundation and the U.S. President's Emergency Plan for AIDS Relief $10 million partnership to provide grants to organisations working to meet the HIV-related needs of Lesbian, Gay, Bisexual and Transgender people. REUTERS/Suzanne Plunkett 

Singer Elton John speaks at a reception at The U.S. Ambassador's London residence, Britain, November 4, 2015. The reception celebrated the launch of the Elton John AIDS Foundation and the U.S. President's Emergency Plan for AIDS Relief $10 million partnership to provide grants to organisations working to meet the HIV-related needs of Lesbian, Gay, Bisexual and Transgender people. REUTERS/Suzanne Plunkett 

U.S. Global AIDS Coordinator Ambassador Deborah Birx, U.S. Ambassador to the United Kingdom Matthew Barzun, singer Elton John, his partner David Furnish and the Ambassador's wife Brooke Brown Barzun (L-R) pose for a photo during a reception at The U.S. Ambassador's London residence, Britain, November 4, 2015. The reception celebrated the launch of the Elton John AIDS Foundation and the U.S. President's Emergency Plan for AIDS Relief $10 million partnership to provide grants to organisations working to meet the HIV-related needs of Lesbian, Gay, Bisexual and Transgender people. REUTERS/Suzanne Plunkett 

U.S. Global AIDS Coordinator Ambassador Deborah Birx, U.S. Ambassador to the United Kingdom Matthew Barzun, singer Elton John, his partner David Furnish and the Ambassador's wife Brooke Brown Barzun (L-R) pose for a photo during a reception at The U.S. Ambassador's London residence, Britain, November 4, 2015. The reception celebrated the launch of the Elton John AIDS Foundation and the U.S. President's Emergency Plan for AIDS Relief $10 million partnership to provide grants to organisations working to meet the HIV-related needs of Lesbian, Gay, Bisexual and Transgender people. REUTERS/Suzanne Plunkett 

The waiting area of the former Ambassadors Club is seen inside the Trans World Airlines Flight Center at John F. Kennedy Airport in the Queens borough of New York, October 18, 2015. Thousands of visitors are expected at New York's John F. Kennedy Airport to get a last look at the iconic architecture of the Trans World Airlines Flight Center before the futuristic 1960s building is converted into a hotel. REUTERS/Shannon Stapleton 

U.S. Secretary of State John Kerry (C) talks with James Costos (L), U.S. ambassador to Spain, after his arrival at Torrejon air base, near Madrid, October 18, 2015. REUTERS/Chema Moya/Pool 

U.S. Secretary of State John Kerry (C) waves next to U.S. ambassador in Spain James Costos (L) after his arrival at Torrejon's air base, near Madrid, October 18, 2015. REUTERS/Chema Moya/Pool 

London's Mayor Boris Johnson (L) talks with British ambassador to Japan Timothy Hitchens (2nd L) and Yoshiro Mori, former Japanese prime minister and President of the Tokyo 2020 Olympic and Paralympic Games organizing committee, at a game of Street Rugby outside the Tokyo Square Gardens building October 15, 2015. The game event was held with the attendance of school children, Nihonbashi, Yaesu and Kyobashi Community Associations and Street Rugby Alliance to mark Japan hosting the Rugby World Cup in 2019. Johnson is in Japan to lead a trade mission as part of his plans to strengthen cultural ties with Tokyo, with the aim of encouraging investment, job creation and economic growth in London. REUTERS/Issei Kato 

Ambassadors and embassy officials from European countries gather at the bombing scene during a commemoration for the victims of Saturday's bomb blasts in the Turkish capital, in Ankara, Turkey, October 12, 2015. Turkey's government said on Monday Islamic State was the prime suspect in suicide bombings that killed at least 97 people in Ankara, but opponents vented anger at President Tayyip Erdogan at funerals, universities and courthouses. REUTERS/Umit Bektas TPX IMAGES OF THE DAY

U.S. Ambassador to Iraq Stuart Jones (R) introduces Lt. Gen. Sean MacFarland as the new commander general of the U.S.-led coalition in Iraq and Col. Steve Warren as the coalition's new spokesman during a news conference at the U.S. Embassy in the heavily fortified Green Zone in Baghdad, Iraq, October 1, 2015. REUTERS/Khalid Mohammed/Pool TPX IMAGES OF THE DAY

Drivers decorate a yellow ambassador taxi to celebrate the festival of Vishwakarma Puja or the festival of the Hindu deity of architecture and machinery, outside a temple in Kolkata, India, September 18, 2015. During the festival, most of the vehicles and machines are decorated and prayers are offered for trouble-free working and good business all the year. REUTERS/Rupak De Chowdhuri 

A driver decorates his yellow ambassador taxi to celebrate the festival of Vishwakarma Puja or the festival of the Hindu deity of architecture and machinery, outside a temple in Kolkata, India, September 18, 2015. During the festival, most of the vehicles and machines are decorated and prayers are offered for trouble-free working and good business all the year. REUTERS/Rupak De Chowdhuri 

France's climate ambassador Laurence Tubiana attends the "France is committed to climate. Go COP21 !" event at the Elysee Palace in Paris, France, September 10, 2015. Paris will host the World Climate Summit, called the COP21, from November 30 to December 11, 2015. REUTERS/Charles Platiau 

France's climate ambassador Laurence Tubiana attends the "France is committed to climate. Go COP21 !" event at the Elysee Palace in Paris, France, September 10, 2015. Paris will host the World Climate Summit, called the COP21, from November 30 to December 11, 2015. REUTERS/Charles Platiau 

France's climate ambassador Laurence Tubiana attends the "France is committed to climate. Go COP21 !" event at the Elysee Palace in Paris, France, September 10, 2015. Paris will host the World Climate Summit, called the COP21, from November 30 to December 11, 2015. REUTERS/Charles Platiau