Kerry told reporters Friday at the State Department: "This has to stop. Nobody has any question about that. "
But he adds that it "is not going to stop just by whining about it. It is not going to stop by walking away from the table or not engaging.
You have to have a negotiation to arrive at the modalities of all parties complying and providing the access and providing for a ceasefire.
The next days will tell the story of whether people are serious or people are not serious."