If anything else, Russia should be blamed for it. Because, knowing full well US will be using ceasefire to regroup terrorist and attack, russia was too eager to make deal with US. By doing this US is accomplishing 2 things:
1) preparing Nusra and IS for attack
2) creating distrust among Russia, Syria, Iran. Underline message Russia relaying is that Russia can not be trusted.
1) preparing Nusra and IS for attack
2) creating distrust among Russia, Syria, Iran. Underline message Russia relaying is that Russia can not be trusted.