He can't be trusted, and his word has a half-life measured in a few months, tops, before he starts twisting around and re-interpreting it.
The whole so-called cynical strategy of having others fight the wars we want fought is an exercise in arrogance worthy of Napoleon, coupled with the Realpolitik comprehension level of Neville Chamberlain. The countries in the region are not led by idiots or tools. Based on the Obama track record so far, they would have to be on drugs to put our interests ahead of theirs, or to put any credence in statements from Obama about having their back.
We used to have a saying about our higher military headquarters, one of the Army major commands (MACOMs) which was that their real motto was "All assistance possible, short of actual help." That is exactly what any alleged ally can expect from Obama, whether the ally is Israel, an Islamic country, or a secular one.