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

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'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

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

Bahrain Crown Prince Salman bin Hamad Al Khalifa attends the Gulf Cooperation Council's (GCC) 37th Summit in Manama, Bahrain, December 6, 2016. REUTERS/Hamad I Mohammed

United Arab Emirates Prime Minister, Mohammed bin Rashid Al Maktoum attends the Gulf Cooperation Council's (GCC) 37th Summit in Manama, Bahrain, December 6, 2016. REUTERS/Hamad I Mohammed

Emir of Qatar Sheikh Hamad bin Khalifa Al-Thani is received by Bahrain's King Hamad bin Isa Al Khalifa upon his arrival at Sakhir VIP airport to attend the Gulf Cooperation Council's (GCC) 37th Summit, Bahrain, December 6, 2016. REUTERS/Hamad I Mohammed

United Arab Emirates Prime Minister, Mohammed bin Rashid Al Maktoum arrives at Sakhir VIP airport to attend the Gulf Cooperation Council's (GCC) 37th Summit, Bahrain, December 6, 2016. REUTERS/Hamad I Mohammed

United Arab Emirates Prime Minister, Mohammed bin Rashid Al Maktoum arrives at Sakhir VIP airport to attend the Gulf Cooperatiion Council's (GCC) 37th Summit, Bahrain, December 6, 2016. REUTERS/Hamad I Mohammed

A general view of Miami Beach in the port city of Alexandria, Egypt, August 15, 2016. Picture taken August 15, 2016. To match Special Report EUROPE-MIGRANTS/EGYPT-SHIP REUTERS/Stephen Grey

Britain's Prime Minister Theresa May is welcomed by Bahrain's Prime Minister Prince Khalifa bin Salman al-Khalifa at Bahrain International Airport ahead of the Gulf Cooperation Council (GCC) Summit in Manama, Bahrain December 5, 2016. REUTERS/Stefan Wermuth

Britain's Prime Minister Theresa May is welcomed by Bahrain's Prime Minister Prince Khalifa bin Salman al-Khalifa at Bahrain International Airport ahead of the Gulf Cooperation Council (GCC) Summit in Manama, Bahrain December 5, 2016. REUTERS/Stefan Wermuth

Britain's Prime Minister Theresa May is welcomed by Bahrain's Prime Minister Prince Khalifa bin Salman al-Khalifa at Bahrain International Airport ahead the Gulf Cooperation Council (GCC) Summit in Manama, Bahrain December 5, 2016. REUTERS/Stefan Wermuth

Britain's Prime Minister Theresa May is welcomed by Bahrain's Prime Minister Prince Khalifa bin Salman al-Khalifa at Bahrain International Airport ahead the Gulf Cooperation Council (GCC) Summit in Manama, Bahrain December 5, 2016. REUTERS/Stefan Wermuth

Britain's Prime Minister Theresa May is welcomed by Bahrain's Prime Minister Prince Khalifa bin Salman al-Khalifa at Bahrain International Airport ahead the Gulf Cooperation Council (GCC) Summit in Manama, Bahrain December 5, 2016. REUTERS/Stefan Wermuth

Britain's Prime Minister Theresa May is welcomed by Bahrain's Prime Minister Prince Khalifa bin Salman al-Khalifa at Bahrain International Airport ahead the Gulf Cooperation Council (GCC) Summit in Manama, Bahrain December 5, 2016. REUTERS/Stefan Wermuth

Actor Al Pacino (L) arrives at the Kennedy Center Honors Reception at the White House in Washington, U.S., December 4, 2016. REUTERS/Yuri Gripas

Actor Al Pacino (L) arrives at the Kennedy Center Honors Reception at the White House in Washington, U.S., December 4, 2016. REUTERS/Yuri Gripas

Kennedy Center Honoree actor Al Pacino and Lucila Sola arrive for the Kennedy Center Honors in Washington, U.S. December 4, 2016. REUTERS/Joshua Roberts

Kennedy Center Honoree actor Al Pacino arrives for the Kennedy Center Honors in Washington, U.S. December 4, 2016. REUTERS/Joshua Roberts

Kennedy Center Honoree actor Al Pacino and Lucila Sola arrive for the Kennedy Center Honors in Washington, U.S. December 4, 2016. REUTERS/Joshua Roberts

Kennedy Center Honoree actor Al Pacino and Lucila Sola arrive for the Kennedy Center Honors in Washington, U.S. December 4, 2016. REUTERS/Joshua Roberts

Kennedy Center Honoree actor Al Pacino arrives for the Kennedy Center Honors in Washington, U.S. December 4, 2016. REUTERS/Joshua Roberts

Actor Al Pacino (R) gives thanks as he is greeted at the Kennedy Center Honors in Washington, U.S., December 4, 2016. REUTERS/Yuri Gripas

Actor Al Pacino (C bottom) waves as he is greeted at the Kennedy Center Honors in Washington, U.S., December 4, 2016. REUTERS/Yuri Gripas

Actor Al Pacino (C) reacts as he is recognized at the Kennedy Center Honors Reception at the White House in Washington, U.S., December 4, 2016. REUTERS/Yuri Gripas

Actor Al Pacino (L) and singer Mavis Staples attend the Kennedy Center Honors Reception at the White House in Washington, U.S., December 4, 2016. REUTERS/Yuri Gripas

U.S. President Barack Obama (L) greets actor Al Pacino at the Kennedy Center Honors Reception at the White House in Washington, U.S., December 4, 2016. REUTERS/Yuri Gripas

U.S. President Barack Obama (L) greets actor Al Pacino at the Kennedy Center Honors Reception at the White House in Washington, U.S., December 4, 2016. REUTERS/Yuri Gripas

2016 Kennedy Center Honoree actor Al Pacino checks his image in a mirror prior to a group photo after a gala dinner at the U.S. State Department, in Washington, U.S., December 3, 2016. REUTERS/Mike Theiler

2016 Kennedy Center Honoree actor Al Pacino (R) shakes hands with U.S. Secretary of State John Kerry as they await a group photo after a gala dinner at the U.S. State Department, in Washington, U.S., December 3, 2016. REUTERS/Mike Theiler

2016 Kennedy Center Honoree actor Al Pacino (L, seated) kisses singer Mavis Staples as fellow honorees, pianist Martha Argerich and members of rock band Eagles (standing, L-R) Joe Walsh, Don Henley and Timothy B. Schmit, watch after a gala dinner at the U.S. State Department, in Washington, U.S., December 3, 2016. REUTERS/Mike Theiler

2016 Kennedy Center Honoree actor Al Pacino (L) chats with a guest after a gala dinner at the U.S. State Department, in Washington, U.S., December 3, 2016. REUTERS/Mike Theiler

2016 Kennedy Center Honoree actor Al Pacino has his ribbon adjusted prior to a group photo with fellow honorees after a gala dinner at the U.S. State Department, in Washington, U.S., December 3, 2016. REUTERS/Mike Theiler

2016 Kennedy Center Honorees pose for a group photo after a gala dinner at the U.S. State Department, in Washington, U.S., December 3, 2016. From L-R: (seated) actor Al Pacino, singer Mavis Staples, pianist Martha Argerich, singer-songwriter James Taylor; (standing) members of rock band Eagles, Joe Walsh, Don Henley and Timothy B. Schmit. REUTERS/Mike Theiler

Emirati Foreign Minister Sheikh Abdullah bin Zayed al-Nahyan speaks during a visit by French President Francois Hollande to Louvre Abu Dhabi, in Abu Dhabi, United Arab Emirates, December 3, 2016. REUTERS/Stringer

Iraqi Foreign Minister Ibrahim al-Jaafari attends the Rome MED Mediterranean Dialogues forum in Rome, Italy December 1, 2016. REUTERS/Tony Gentile

Iraqi Foreign Minister Ibrahim al-Jaafari attends the Rome MED Mediterranean Dialogues forum in Rome, Italy December 1, 2016. REUTERS/Tony Gentile

Italy's Defence Minister Roberta Pinotti (L) and Iraqi Foreign Minister Ibrahim al-Jaafari attend the Rome MED Mediterranean Dialogues forum in Rome, Italy December 1, 2016. REUTERS/Tony Gentile

Italy's Defence Minister Roberta Pinotti (R) shakes hand with Iraqi Foreign Minister Ibrahim al-Jaafari during Rome MED Mediterranean Dialogues forum in Rome, Italy December 1, 2016. REUTERS/Tony Gentile

Italy's Defence Minister Roberta Pinotti (R) shakes hands with Iraqi Foreign Minister Ibrahim al-Jaafari during the Rome MED Mediterranean Dialogues forum in Rome, Italy December 1, 2016. REUTERS/Tony Gentile

Italy's Defence Minister Roberta Pinotti (L) and Iraqi Foreign Minister Ibrahim al-Jaafari attend the Rome MED Mediterranean Dialogues forum in Rome, Italy December 1, 2016. REUTERS/Tony Gentile

An Iraqi father (L) mourns the death of his son, who was killed during clashes in the Islamic State stronghold of Mosul, in al-Samah neighborhood, Iraq December 1, 2016. REUTERS/Mohammed Salem

Donkeys injured during clashes between Iraqi soldiers and Islamic State fighters lie on the ground in Al-Qasar, South-East of Mosul, Iraq November 28, 2016. REUTERS/Goran Tomasevic

Iraqi soldiers prepare to search a house damaged during clashes with Islamic State fighters in Al-Qasar, South-East of Mosul, Iraq November 28, 2016. REUTERS/Goran Tomasevic

An Iraqi soldier gestures from an armoured vehicle during clashes with Islamic State fighters in Al-Qasar, South-East of Mosul, Iraq November 28, 2016. REUTERS/Goran Tomasevic

Iraqi soldiers fire a tank shell during clashes with Islamic State fighters in Al-Qasar, South-East of Mosul, Iraq November 28, 2016. REUTERS/Goran Tomasevic

Iraqi soldiers look as smoke rises over the village of Al-Qasar during fighting between Iraqi soldiers and Islamic State fighters South-East of Mosul, Iraq November 28, 2016. REUTERS/Goran Tomasevic

An Iraqi soldier runs for cover as he fires his rifle during clashes with Islamic State fighters in Al-Qasar, South-East of Mosul, Iraq November 28, 2016. REUTERS/Goran Tomasevic

Iraqi soldiers search a house during clashes with Islamic State fighters in Al-Qasar, South-East of Mosul, Iraq November 28, 2016. REUTERS/Goran Tomasevic

Iraqi soldiers stand on top of armoured vehicles before clashes with Islamic State fighters in Al-Qasar, South-East of Mosul, Iraq November 28, 2016. REUTERS/Goran Tomasevic

An Iraqi soldier uses his rifle to hold up a helmet as a decoy during clashes with Islamic State fighters in Al-Qasar, South-East of Mosul, Iraq November 28, 2016. REUTERS/Goran Tomasevic

Smoke rises after a tank shell hits a house in village of Al-Qasar during fighting between Iraqi soldiers and Islamic State fighters South-East of Mosul, Iraq November 28, 2016. REUTERS/Goran Tomasevic

Iraqi soldier stand on top of armoured vehicle before clashes with Islamic State fighters in Al-Qasar, South-East of Mosul, Iraq November 28, 2016. REUTERS/Goran Tomasevic

Iraqi soldiers drive tanks during clashes with Islamic State fighters in Al-Qasar, South-East of Mosul, Iraq November 28, 2016. REUTERS/Goran Tomasevic