Indeed, Syria has been able to change its regime, and Iran is clearly unbalanced in power, so if the US joins in, it will be possible to make it pro-American "again".
However, I was really surprised that the "two weeks" was a trick. It seems that, in his mind, the latest attack was also part of the negotiation process with no declaration of war and it's still ongoing, but how far will such an attitude work in the world?
