Russian President Vladimir Putin on Friday held phone calls with the leaders of Israel and Iran, the Kremlin said, offering mediation amid large-scale protests in Iran that have raised fears of a military confrontation in the region.Independent monitors say Iranian security forces have killed thousands in a forceful response to nationwide anti-government protests a crackdown that prompted threats of military action by the United States, Israel's key ally.Iran and Israel fought a brief war in June that saw unprecedented Israeli attacks on Iranian military and nuclear facilities. The United States had briefly joined those strikes, hitting three major Iranian nuclear...