It would present an "opportunity" for spy agencies if the foreign minister of Russia or Iran were to use a private email server for official business, the chief of the U.S. National Security Agency said on Thursday.
Rebels who have inflicted big losses on Syrian President Bashar al-Assad say Russia's intervention in support of its ally will only lead to an escalation of the war and may encourage the rebels' Gulf Arab backers to pour in more military aid.
Prime Minister Benjamin Netanyahu flew to Moscow on Monday to seek reassurance from President Vladimir Putin about Russia's military deployment in Syria and to lay out Israel's concerns about the risk of weapons reaching militants on its borders.