At a UN Security Council meeting, the US Secretary of State, John Kerry, blamed President Bashar Assad for violations of the ceasefire in Syria and added that Assad “does not believe in ceasefire.”
This is why, according to the US official, the Syrian Air Force should be banned from flying over territories held by the so-called “moderate opposition” (most likely Kerry meant Jabhat al-Nusra or Jund al-Aqsa).
Kerry emphasized that this shouldbe done in order to deliver humanitarian aid in northern Syria.
He also said that the attack on the aid convoy raise “profound doubt” over whether Russia and Syria would live up to the Geneva deal. Unofrutnately, he forgot to added that there are no proves that the convoy was attacked by Russian or Syrian warplanes (more here).
In general, such a statement show that the US is not going to search a solution of the Syrian crisis by peaceful measures and just pushing own agenda on the diplomatic level.
