CAIRO, Egypt - Iran has unveiled with great fanfare a series of what it portrays as sophisticated, homegrown weapons — flying boats and missiles invisible to radar, torpedoes too fast to elude. But experts said Tuesday it appears much of the technology came from Russia and questioned Iran's claims about the weapons' capabilities. Still, the armaments, tested during war games by some 17,000 Revolutionary Guards in the Persian Gulf, send what may be Iran's real message: its increased ability to hit oil tankers if tension with America turns to outright confrontation. To underline that message, the maneuvers — code-named "The...