Asked about options such as imposing a no-fly zone over rebel-held territory, Clinton said these were possibilities she and Davutoglu had agreed “need greater in-depth analysis”, while indicating that no decisions were necessarily imminent.

“It is one thing to talk about all kinds of potential actions, but you cannot make reasoned decisions without doing intense analysis and operational planning,” she said.

Though possible intervention appears to be a distant prospect, her remarks were nevertheless the closest Washington has come to suggesting direct military action in Syria…

Davutoglu said it was time outside powers took decisive steps to resolve the humanitarian crisis in cities such as Aleppo, where Assad’s forces have fought rebels for three weeks.