U.S. Secretary of State John Kerry gestures during a news conference in Riyadh, Saudi Arabia December 18, 2016. REUTERS/Faisal Al Nasser 

U.S. Secretary of State John Kerry (L) speaks with Oman's Foreign Minister Yusuf bin Alawi bin Abdullah before a meeting in Riyadh, Saudi Arabia December 18, 2016. REUTERS/Faisal Al Nasser 

Saudi Arabia's Foreign Minister Adel al-Jubeir attends a meeting with U.S. Secretary of State John Kerry and several Gulf Cooperation Council (GCC) foreign ministers in Riyadh, Saudi Arabia December 18, 2016. REUTERS/Faisal Al Nasser 

U.S. Secretary of State John Kerry attends a meeting with several Gulf Cooperation Council (GCC) foreign ministers in Riyadh, Saudi Arabia December 18, 2016. REUTERS/Faisal Al Nasser 

(L-R) Britain's MP Tobias Ellwood, Emirati Foreign Minister Sheikh Abdullah bin Zayed al-Nahyan, Saudi Arabia's Foreign Minister Adel al-Jubeir, U.S. Secretary of State John Kerry, Oman's Foreign Minister Yusuf bin Alawi bin Abdullah, and U.N. special envoy to Yemen Ismail Ould Cheikh Ahmed pose for a group photo in Riyadh, Saudi Arabia December 18, 2016. REUTERS/Faisal Al Nasser 

Iraqi Foreign Minister Ibrahim al-Jaafari speaks during a news conference in Baghdad, December 18, 2016. REUTERS/Ahmed Saad 

Iraqi Foreign Minister Ibrahim al-Jaafari speaks during a news conference in Baghdad, December 18, 2016. REUTERS/Ahmed Saad 

Iraqi Foreign Minister Ibrahim al-Jaafari speaks during a news conference in Baghdad, December 18, 2016. REUTERS/Ahmed Saad 

Journalists raise their hand to ask a question during a news conference for Iraqi Foreign Minister Ibrahim al-Jaafari in Baghdad, December 18, 2016. REUTERS/Ahmed Saad 

Iraqi Foreign Minister Ibrahim al-Jaafari speaks during a news conference in Baghdad, December 18, 2016. REUTERS/Ahmed Saad 

Mourners react during the funeral of Palestinian Ahmed al-Remawi, who Palestinian Health Ministry said was shot and killed by Israeli forces on Sunday during violent clashes with Palestinian stone-throwers, in the West Bank village of Beit Rima near Ramallah December 18, 2016. REUTERS/Mohamad Torokman 

U.S. President-elect Donald Trump listens to Senator Jeff Sessions (R-AL) (L) speak during a USA Thank You Tour event in Mobile, Alabama, U.S., December 17, 2016. REUTERS/Lucas Jackson 

U.S. President-elect Donald Trump listens to Senator Jeff Sessions (R-AL) (L) speak during a USA Thank You Tour event in Mobile, Alabama, U.S., December 17, 2016. REUTERS/Lucas Jackson 

Senator Jeff Sessions (R-AL) waits for U.S. President-elect Donald Trump to exit his plane after arriving for stop on his USA Thank You Tour event in Mobile, Alabama, U.S., December 17, 2016. REUTERS/Lucas Jackson 

Senator Jeff Sessions (R-AL) and Alabama Governor Robert J. Bentley greet U.S. President-elect Donald Trump next to a group of gathered Azalea Trail Maids as he arrives for a stop on his USA Thank You Tour event in Mobile, Alabama, U.S., December 17, 2016. REUTERS/Lucas Jackson 

Senator Jeff Sessions (R-AL) (L) and Alabama Governor Robert J. Bentley (2nd L) watch as U.S. President-elect Donald Trump greets a group of gathered Azalea Trail Maids as he arrives for stop on his USA Thank You Tour event in Mobile, Alabama, U.S., December 17, 2016. REUTERS/Lucas Jackson 

A member of forces loyal to Syria's President Bashar al-Assad stands near damaged buildings in Aleppo's Salaheddine district, Syria December 16, 2016. REUTERS/Omar Sanadiki 

Britain Rugby Union - Bath Rugby v Cardiff Blues - European Rugby Challenge Cup Pool Four - Recreation Ground - 15/12/16 Aled Brew of Bath Rugby scores their third try Action Images via Reuters / Henry Browne Livepic EDITORIAL USE ONLY. 

Britain Rugby Union - Bath Rugby v Cardiff Blues - European Rugby Challenge Cup Pool Four - Recreation Ground - 15/12/16 Aled Brew of Bath Rugby runs in to score their third try Action Images via Reuters / Henry Browne Livepic EDITORIAL USE ONLY. 

Britain's Defence Secretary Michael Fallon (L) greets Iraq's General Othman al-Ghanim at the Foreign Office in London, Britain December 15, 2016. REUTERS/Stefan Rousseau/Pool 

A timeline of pictures from Aleppo, Syria. Restoring full control over Aleppo, Syria's most populous city before the war, has been seen as critical to the fortunes of Syrian President Bashar al-Assad in a multi-sided civil war now in its sixth year. Insurgents who had held the eastern part of the city since the early days of the war effectively agreed to surrender what remained of their besieged enclave and evacuate after a fierce government assault. REUTERS/Staff SEARCH "ALEPPO TIMELINE" FOR THIS STORY TPX IMAGES OF THE DAY Matching text: MIDEAST-CRISIS/SYRIA-ALEPPO 

A hot-air balloon flies over the village of al-Qurna, situated over a necropolis of more than 500 pharaonic tombs at the feet of the Theban Mountains, in the city of Luxor, south of Cairo, Egypt December 13, 2016. REUTERS/Amr Abdallah Dalsh 

Actor Orlando Bloom interviews ambassador Mustafa Al Said (C) with translator Adam Bakri at the UNICEF 70th anniversary event at the United Nations Headquarters in Manhattan, New York City, U.S., December 12, 2016. REUTERS/Andrew Kelly 

Actors Orlando Bloom and Millie Bobby Brown and advocate Mustafa Al Said attend the UNICEF 70th anniversary event at the United Nations Headquarters in Manhattan, New York City, U.S., December 12, 2016. REUTERS/Andrew Kelly 

Policemen look through a hole in a house from the clashes in Qaraqosh, near Mosul, Iraq, December 9, 2016. Picture taken December 9, 2016. REUTERS/Alaa Al-Marjani TPX IMAGES OF THE DAY 

An Iraqi Christian soldier walks in the damaged Church of the Immaculate Conception after Iraqi forces recaptured it from Islamic State in Qaraqosh, near Mosul, Iraq, December 9, 2016. Picture taken December 9, 2016. REUTERS/Alaa Al-Marjani 

The damaged Church of the Immaculate Conception is seen after Iraqi forces recaptured it from Islamic State in Qaraqosh, near Mosul, Iraq, December 9, 2016. Picture taken December 9, 2016. REUTERS/Alaa Al-Marjani 

Iraqi Christians come to visit the heavily damaged Church of the Immaculate Conception after Iraqi forces recaptured it from Islamic State in Qaraqosh, near Mosul, Iraq, December 9, 2016. Picture taken December 9, 2016. REUTERS/Alaa Al-Marjani 

Policemen look through a hole in a house from the clashes in Qaraqosh, near Mosul, Iraq, December 9, 2016. Picture taken December 9, 2016.REUTERS/Alaa Al-Marjani 

Iraqi Christian soldier walk in the damaged Church of the Immaculate Conception after Iraqi forces recaptured it from Islamic State in Qaraqosh, near Mosul, Iraq, December 9, 2016. Picture taken December 9, 2016. REUTERS/Alaa Al-Marjani 

An Iraqi policeman sites at a house damage from the clashes in Qaraqosh, near Mosul, Iraq, December 9, 2016. Picture taken December 9, 2016.REUTERS/Alaa Al-Marjani 

Policemen look through a hole in a house from the clashes in Qaraqosh, near Mosul, Iraq, December 9, 2016. Picture taken December 9, 2016. REUTERS/Alaa Al-Marjani 

The damaged Church of the Immaculate Conception is seen after Iraqi forces recaptured it from Islamic State in Qaraqosh, near Mosul, Iraq, December 9, 2016. Picture taken December 9, 2016. REUTERS/Alaa Al-Marjani 

The damaged Church of the Immaculate Conception is seen after Iraqi forces recaptured it from Islamic State in Qaraqosh, near Mosul, Iraq, December 9, 2016. Picture taken December 9, 2016. REUTERS/Alaa Al-Marjani 

Iraqi Christians come to visit the heavily damaged Church of the Immaculate Conception after Iraqi forces recaptured it from Islamic State in Qaraqosh, near Mosul, Iraq, December 9, 2016. Picture taken December 9, 2016. REUTERS/Alaa Al-Marjani 

Members of the Iraqi Army fire towards Islamic State militant positions at the south of Mosul, Iraq December 10, 2016. REUTERS/Alaa Al-Marjani TPX IMAGES OF THE DAY 

Qatari Foreign Minister Sheikh Mohammed bin Abdulrahman Al Thani, U.S. Secretary of State John Kerry, France's Foreign Minister Jean Marc Ayrault, and German Foreign Minister Frank-Walter Steinmeier (L-R) attend a news conference after a meeting in Paris, France December 10, 2016. REUTERS/Benoit Tessier 

Qatari Foreign Minister Sheikh Mohammed bin Abdulrahman Al Thani, U.S. Secretary of State John Kerry, France's Foreign Minister Jean Marc Ayrault, and German Foreign Minister Frank-Walter Steinmeier (L-R) attend a news conference after a meeting in Paris, France December 10, 2016. REUTERS/Benoit Tessier 

Qatari Foreign Minister Sheikh Mohammed bin Abdulrahman Al Thani attends a news conference after a meeting in Paris, France December 10, 2016. REUTERS/Benoit Tessier 

Britain's Foreign Secretary Boris Johnson (L) and Bahrain's Crown Prince Salman bin Hamad Al Khalifa (R) make their way to the IISS Regional Security Summit "The Manama Dialogue" in Manama, Bahrain December 9, 2016. REUTERS/Hamad I Mohammed 

Bahrian's Crown Prince, Salman bin Hamad Al Khalifa (R) speaks to British journalist Frank Gardner as he arrives at the IISS Regional Security Summit "The Manama Dialogue" in Manama, Bahrain December 9, 2016. REUTERS/Hamad I Mohammed 

Yemen's Vice President General Ali Mohsen al-Ahmar (C) speaks to journalists at the IISS Regional Security Summit "The Manama Dialogue" in Manama, Bahrain December 9, 2016. REUTERS/Hamad I Mohammed 

Yemen's Vice President General Ali Mohsen al-Ahmar (C) arrives at the IISS Regional Security Summit "The Manama Dialogue" in Manama, Bahrain December 9, 2016. REUTERS/Hamad I Mohammed 

United Arab Emirates Foreign Minister Abdullah Bin Zayed Al Nahyan arrives at the IISS Regional Security Summit 'The Manama Dialogue' in Manama, Bahrain December 9, 2016. REUTERS/Hamad I Mohammed 

A member of Forces loyal to Syria's President Bashar al-Assad sits inside an armoured vehicle in a government held area of Aleppo, Syria December 9, 2016. REUTERS/Omar Sanadiki 

U.S. Senator Jeff Sessions (R-AL), President-elect Donald Trump's nominee to be Attorney General, greets a woman as he departs the Senate floor at the Capitol in Washington, U.S. December 7, 2016. REUTERS/Jonathan Ernst 

HUD Secretary-nominee and former Republican presidential candidate Ben Carson (C) meets with Senate Banking, Housing and Urban Affairs Committee Chairman Richard Shelby (R-AL) on Capitol Hill in Washington, U.S., December 7, 2016. REUTERS/Joshua Roberts 

HUD Secretary-nominee and former Republican presidential candidate Ben Carson (R) walks after meeting with Senate Banking, Housing and Urban Affairs Committee Chairman Richard Shelby (R-AL) on Capitol Hill in Washington, U.S., December 7, 2016. REUTERS/Joshua Roberts 

HUD Secretary-nominee and former Republican presidential candidate Ben Carson stands after meeting with Senate Banking, Housing and Urban Affairs Committee Chairman Richard Shelby (R-AL) on Capitol Hill in Washington, U.S., December 7, 2016. REUTERS/Joshua Roberts 

HUD Secretary-nominee and former Republican presidential candidate Ben Carson (R) walks after meeting with Senate Banking, Housing and Urban Affairs Committee Chairman Richard Shelby (R-AL) on Capitol Hill in Washington, U.S., December 7, 2016. REUTERS/Joshua Roberts 

HUD Secretary-nominee and former Republican presidential candidate Ben Carson (R) meets with Senate Banking, Housing and Urban Affairs Committee Chairman Richard Shelby (R-AL) on Capitol Hill in Washington, U.S., December 7, 2016. REUTERS/Joshua Roberts 

Britain's Prime Minister Theresa May (top left) meets Sheikh Tamim bin Hamad Al Thani, the Emir of Qatar, during a bilateral meeting at the Gulf Cooperation Council summit, in Manama, Bahrain, December 7, 2016. REUTERS/Carl Court/Pool 

Britain's Prime Minister Theresa May meets Sheikh Tamim bin Hamad Al Thani, the Emir of Qatar, during a bilateral meeting at the Gulf Cooperation Council summit, in Manama, Bahrain, December 7, 2016. REUTERS/Carl Court/Pool 

Sheikh Tamim bin Hamad Al Thani, the Emir of Qatar smiles as he speaks to Britain's Prime Minister Theresa May during a bilateral meeting at the Gulf Cooperation Council summit, in Manama, Bahrain, December 7, 2016. REUTERS/Carl Court/Pool 

Britain's Prime Minister Theresa May meets Sheikh Tamim bin Hamad Al Thani, the Emir of Qatar, during a bilateral meeting at the Gulf Cooperation Council summit, in Manama, Bahrain, December 7, 2016. REUTERS/Carl Court/Pool 

Britain's Prime Minister Theresa May meets Sheikh Tamim bin Hamad Al Thani, the Emir of Qatar, during a bilateral meeting at the Gulf Cooperation Council summit, in Manama, Bahrain, December 7, 2016. REUTERS/Carl Court/Pool 

Britain's Prime Minister Theresa May and Bahrain's King Hamad bin Isa al-Khalifa (R) join other leaders for a family photo at the Gulf Cooperation Council (GCC) Summit in Manama, Bahrain December 7, 2016. REUTERS/Stefan Wermuth 

Britain's Prime Minister Theresa May and Bahrain's King Hamad bin Isa al-Khalifa (R) join other leaders for a family photo at the Gulf Cooperation Council (GCC) Summit in Manama, Bahrain December 7, 2016. REUTERS/Stefan Wermuth 

Britain's Prime Minister Theresa May talks with Bahrain's King Hamad bin Isa al-Khalifa before a family photo at the Gulf Cooperation Council (GCC) Summit in Manama, Bahrain December 7, 2016. REUTERS/Stefan Wermuth 

Britain's Prime Minister Theresa May and Bahrain's King Hamad bin Isa al-Khalifa (R) join other leaders for a family photo at the Gulf Cooperation Council (GCC) Summit in Manama, Bahrain December 7, 2016. REUTERS/Stefan Wermuth