DAMASCUS, SYRIA - DECEMBER 16: Syrian people gather to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, at the Douma town of Eastern Goutha in Damascus, Syria on December 16, 2016. ( Yusuf el Bustani - Anadolu Agency )

DAMASCUS, SYRIA - DECEMBER 16: Syrian people gather to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, at the Zamalka town of Eastern Goutha in Damascus, Syria on December 16, 2016. ( Khaled El Adel - Anadolu Agency )

PARIS, FRANCE - DECEMBER 17 : People gather to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, in front of Iranian Embassy in Paris, France on December 17, 2016. ( Mustafa Sevgi - Anadolu Agency )

PARIS, FRANCE - DECEMBER 17 : People gather to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, in front of Iranian Embassy in Paris, France on December 17, 2016. ( Mustafa Sevgi - Anadolu Agency )

PARIS, FRANCE - DECEMBER 17 : People gather to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, in front of Iranian Embassy in Paris, France on December 17, 2016. ( Mustafa Sevgi - Anadolu Agency )

PARIS, FRANCE - DECEMBER 17 : People gather to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, in front of Iranian Embassy in Paris, France on December 17, 2016. ( Mustafa Sevgi - Anadolu Agency )

WASHINGTON, USA - DECEMBER 16: Demonstrators hold Syrian flags onto the fence surrounding the Russian Ambassadors Residence during a rally for the people of Aleppo, Syria, in Washington, USA on December 16, 2016. ( Samuel Corum - Anadolu Agency )

WASHINGTON, USA - DECEMBER 16: Demonstrators march in the middle of the street towards the Russian Ambassadors Residence during a rally for the people of Aleppo, Syria, in Washington, USA on December 16, 2016. ( Samuel Corum - Anadolu Agency )

WASHINGTON, USA - DECEMBER 16: Demonstrators dusted with flour representing the civilians killed in Aleppo, during a rally against Bashar Al Assad, in Washington, USA on December 16, 2016. ( Samuel Corum - Anadolu Agency )

NEW YORK, UNITED STATES - DECEMBER 16 : Demonstrators hold banners and wave flags during a demonstration to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, in front of Washington Square Park in New York, United States on December 16, 2016. ( Volkan Furuncu - Anadolu Agency )

NEW YORK, UNITED STATES - DECEMBER 16 : Demonstrators hold banners and wave flags during a demonstration to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, in front of Washington Square Park in New York, United States on December 16, 2016. ( Volkan Furuncu - Anadolu Agency )

NEW YORK, UNITED STATES - DECEMBER 16 : People gather to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, in front of Washington Square Park in New York, United States on December 16, 2016. ( Volkan Furuncu - Anadolu Agency )

LONDON, UNITED KINGDOM - DECEMBER 17: People gather to demonstrate condemning massacres and attacks in Syria's Aleppo over civilians in a march from Marble Arch to Downing Street in London, United Kingdom on December 17,2016. ( Isabel Infantes - Anadolu Agency )

LONDON, UNITED KINGDOM - DECEMBER 17: People gather to demonstrate condemning massacres and attacks in Syria's Aleppo over civilians in a march from Marble Arch to Downing Street in London, United Kingdom on December 17,2016. ( Isabel Infantes - Anadolu Agency )

LONDON, UNITED KINGDOM - DECEMBER 17: People gather to demonstrate condemning massacres and attacks in Syria's Aleppo over civilians in a march from Marble Arch to Downing Street in London, United Kingdom on December 17,2016. ( Isabel Infantes - Anadolu Agency )

LONDON, UNITED KINGDOM - DECEMBER 17: People gather to demonstrate condemning massacres and attacks in Syria's Aleppo over civilians in a march from Marble Arch to Downing Street in London, United Kingdom on December 17,2016. ( Isabel Infantes - Anadolu Agency )

LONDON, UNITED KINGDOM - DECEMBER 17: People gather to demonstrate condemning massacres and attacks in Syria's Aleppo over civilians in a march from Marble Arch to Downing Street in London, United Kingdom on December 17,2016. ( Isabel Infantes - Anadolu Agency )

TORONTO, CANADA - DECEMBER 17: People gather to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, at Dundas Square in Toronto, Canada on December 17, 2016. ( Seyit Aydoğan - Anadolu Agency )

TORONTO, CANADA - DECEMBER 17: People gather to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, at Dundas Square in Toronto, Canada on December 17, 2016. ( Seyit Aydoğan - Anadolu Agency )

TORONTO, CANADA - DECEMBER 17: People gather to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, at Dundas Square in Toronto, Canada on December 17, 2016. ( Seyit Aydoğan - Anadolu Agency )

TORONTO, CANADA - DECEMBER 17: People gather to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, at Dundas Square in Toronto, Canada on December 17, 2016. ( Seyit Aydoğan - Anadolu Agency )

JAKARTA, INDONESIA - DECEMBER 18: People gather to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, in Jakarta, Indonesia, on December 18, 2016. ( Agoes Rudianto - Anadolu Agency )

JAKARTA, INDONESIA - DECEMBER 18: Demonstrators hold banners during a demonstration to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, in Jakarta, Indonesia, on December 18, 2016. ( Agoes Rudianto - Anadolu Agency )

JAKARTA, INDONESIA - DECEMBER 18: Indonesian people take part in a demonstration to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, in Jakarta, Indonesia, on December 18, 2016. ( Agoes Rudianto - Anadolu Agency )

FRANKFURT, GERMANY - DECEMBER 17: People gather to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, at the Opera Square in Frankfurt, Germany on December 17, 2016. ( Abdulselam Durdak - Anadolu Agency )

FRANKFURT, GERMANY - DECEMBER 17: People gather to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, at the Opera Square in Frankfurt, Germany on December 17, 2016. ( Abdulselam Durdak - Anadolu Agency )

FRANKFURT, GERMANY - DECEMBER 17: People gather to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, at the Opera Square in Frankfurt, Germany on December 17, 2016. ( Abdulselam Durdak - Anadolu Agency )

FRANKFURT, GERMANY - DECEMBER 17: People gather to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, at the Opera Square in Frankfurt, Germany on December 17, 2016. ( Abdulselam Durdak - Anadolu Agency )

ZENICA, BOSNIA AND HERZEGOVINA - DECEMBER 17 : People gather to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, at Alija Izetbegovic square in Zenica, Bosnia and Herzegovina on December 17, 2016. ( Haris Badzic - Anadolu Agency )

ZENICA, BOSNIA AND HERZEGOVINA - DECEMBER 17 : People gather to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, at Alija Izetbegovic square in Zenica, Bosnia and Herzegovina on December 17, 2016. ( Haris Badzic - Anadolu Agency )

ZENICA, BOSNIA AND HERZEGOVINA - DECEMBER 17 : People gather to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, at Alija Izetbegovic square in Zenica, Bosnia and Herzegovina on December 17, 2016. ( Haris Badzic - Anadolu Agency )

BREMEN, GERMANY - DECEMBER 16: Demonstrators pray during a protest against Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, in Bremen, Germany on December 16, 2016. ( Birol Tan - Anadolu Agency )

BREMEN, GERMANY - DECEMBER 16: Demonstrators gather to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, in Bremen, Germany on December 16, 2016. ( Birol Tan - Anadolu Agency )

BREMEN, GERMANY - DECEMBER 16: Demonstrators gather to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, in Bremen, Germany on December 16, 2016. ( Birol Tan - Anadolu Agency )

BREMEN, GERMANY - DECEMBER 16: Demonstrators gather to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, in Bremen, Germany on December 16, 2016. ( Birol Tan - Anadolu Agency )

ATHENS, GREECE - DECEMBER 16: Syrian people gather to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, at Exarcheia square in Athens, Greece on December 16, 2016. ( Ayhan Mehmet - Anadolu Agency )

ATHENS, GREECE - DECEMBER 16: Syrian people gather to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, at Exarcheia square in Athens, Greece on December 16, 2016. ( Ayhan Mehmet - Anadolu Agency )

ATHENS, GREECE - DECEMBER 16: Syrian people gather to protest Assad regime forces' and its supporters' attacks on civilians and the humanitarian plight, at Exarcheia square in Athens, Greece on December 16, 2016. ( Ayhan Mehmet - Anadolu Agency )