MOSCOW (Reuters) - Russia is ready to help guard Syrian chemical weapons sites and destroy President Bashar al-Assad's stockpiles but will not ship any of the chemical arms to Russia for destruction, Deputy Foreign Minister Sergei Ryabkov said on Thursday. Ryabkov was outlining some of the contributions Moscow is willing to make to implement a U.S.-Russian deal that calls for the destruction of Syria's chemical arsenal by the middle of next year. ...