When I use a word...(Humpty Dumpty)

When is a cease-fire not a cease-fire?  When it involves the US, Russia and Syria it seems.  The American Secretary of State and the Russian Foreign Minister have announced a temporary "cessation of hostilities" in Syria.  But wait - this is not to include military action against Islamic State (or whatever we're calling them at the moment).  And given that Russia seem to be bombing the shit out of anything and anyone opposing Assad on the basis that it might be Islamic State, I don't think this will make the ordinary Syrian man in the street feel any safer.