US Secretary of State John Kerry said Monday it was "urgent" to set a date for the so-called Geneva 2 meeting on the future of Syria and said a transition government was the only way forward.

After meeting with UN special representative Lakhdar Brahimi in London, Kerry said "we believe that it is urgent to set a date to convene the conference and work toward a new Syria" and added that "there has to be a new governing entity in Syria".