Russian President Dmitry Medvedev's reported promise to Israeli President Shimon Peres that Moscow will reconsider the sale of powerful S-300 air-defense missiles to Iran could determine whether Israel - and the United States for that matter - launches pre-emptive strikes against Tehran's nuclear facilities. "President Medvedev promised to review this issue once again after I explained that it would have an impact on the balance of forces in our region," Peres said Wednesday following his meeting with the Russian leader in Moscow on Tuesday. Israel has been threatening to attack Iran's controversial nuclear program for many months because the Jewish...