Russian marine and air power head for Syria versus Western intervention

Putin was giving the West due warning that if they persisted in arming the rebels any further, a Russian troop landing in Syria would take place in the guise of an operation to evacuate endangered Russian nationals.
http://www.debka.com/article/23058/Russian-marine-and-air-power-head-for-Syria-versus-Western-intervention-%E2%80%93-%E2%80%9Cto-defend-Russian-citizens-%E2%80%9D-says-Moscow