"You say Putin didn't make the offer. But don't all diplomats simply spout what they are told to spout by their government (i.e. Putin, in this case).
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Undoubtedly. It most certainly would have come from Putin, but there was no official confirmation of that. As I say, it looked at time, simply like a ploy to save Assad's neck which no doubt is also what the so-called agreement to get rid of chemical weapons also was. And of course that was a complete con as we now see, with all sides cheerfully using them, it would seem.
I think it;s too late to actually topple Assad by direct intervention also. There are so many groups fighting in Syria now, by no means all of them IS, but jihadists and others.
Meanwhile he continues to rain bombs down indiscriminately on civilians, which morally makes him no better than the "terrorists" he is fighting. The only difference being, as he would not hesitate to tell us, that he does not threaten the west: he only kills his own people.