In the deepening international stand-off over Iran's nuclear program, the Islamic Republic's quest for advanced air- and missile defense technologies could play a decisive role. "For years now, Tehran has been working hard to acquire sophisticated Russian antiaircraft missiles that would make it far tougher for Israeli planes to stage a successful attack on Iranian nuclear facilities," Christian Caryl wrote on October 2nd in the online edition of Foreign Policy magazine. That system is the S-300, an advanced interceptor array believed to be superior to the U.S. Patriot. Russia signed a deal to deliver units of the S-300 to Iran...