From the Jamestown Foundation: In response to the Patriot deployment in Poland, Russia might react in kind by finally releasing the S-300 anti-aircraft missiles that it promised but did not finally ship to Iran. The S-300s would cover an important capability gap in Iranian air defenses and the missiles may be claimed to be as defensive in nature as the Patriots. While demonstrating Russian disgust, the completion of the S-300 deal could also earn Moscow up to $1 billion in sales. (photo: Jamestown Foundation)