US Defense Secretary Robert Gates says Russia's proposal that Washington scrap its missile defense system in Eastern Europe is unacceptable. Russian President Dmitry Medvedev has said in an interview that Moscow is willing to reconsider deploying Iskander missiles in its westernmost region of Kaliningrad if the US refrains from launching a limited missile shield in the Czech Republic and Poland. Gates said Thursday that the he was unsure why Russia would want missiles in the Kaliningrad region. Gates says that the biggest threat to Russia's security is Iran and that this is what that the US system is designed to counter. He says the Iskander missiles in Kaliningrad could not protect Russia from this danger.