( CNN) The blame game started even before the guns fell silent. And now it has reach a crescendo of outrage, as US officials accuse Russia of carrying out an airstrike that reached an aid escort northwest of Aleppo, destroying 18 out of 31 lorries.

Russia publicly denies it as it must, but if the US is proved to be right, then the message from the Kremlin is clear — we are prepared to do anything and have no red lines.

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