I'll have to go confirm this. We don't move fifteen aircraft that cost anywhere from hundreds of millions to a billion dollars EACH if we don't think they may be needed for imminent use.
While it could be a show of force, I'm going to assume that we generally don't move that many of them to a hot spot without very good reason.
My assumption from the F117 movements would be that this situation is escalating behind the scenes and is now likely very tense.
Of course we do. We send aircraft carriers all over the world. That sends a "message" to the evil doers. Sometimes it works, sometimes it doesn't. When it doesn't, the weapons are there and ready. It's called deterrence, and like I said, it doesn't always work.