Syrian war

Aleppo, Syria's second city, has been split in two during the country's long conflict. Daily life has become a struggle for those still living there, caught in the fight between rebel and government forces.

Bana's tweets in English - helped by her mother, a teacher - are bringing fresh attention to the struggles they face in rebel-held eastern Aleppo.

In one, Bana appears with her brothers - five-year-old Mohamed, and Noor, three - with the message "drawing with the brothers before the planes come. We need peace to draw."

But announcing the Turkish policy shift, Prime Minister Binali Yildirim insisted that Mr Assad "can't have a role in Syria's future".

"He is one of the actors today, whether we like it or not," Mr Yildirim said.

Fighting has continued in the city of Hassakeh, where Syrian government jets have bombed Kurdish areas for two days.

Hassakeh, 80km (50 miles) south of the Turkish border, is mainly controlled by the Kurdish YPG militia, but Mr Assad's government forces are trying to push them out.