Russia launched a massive security operation for the Sochi Olympics on Tuesday following the high-profile bombings in Volgograd and a vow by Chechen rebel leader Doku Umarov to attack the Games. More than 30,000 police and interior ministry troops have been deployed to the Sochi region, and Russian officials are establishing two security zones to protect the Games. In a “controlled zone” to be set up near the Olympic venues, access will be restricted to people with tickets and proof of identity. An outer “forbidden zone” will also be set up around Sochi to prevent vehicles that are not registered locally and do not have special accreditation to enter the city. The security measures come in addition to a ban last year against protest rallies.