MPs are calling for a security review of UK embassy contractors following the arrest of a British embassy employee on suspicion of spying for Russia. A 57-year-old British national—identified by authorities only as David S—was detained on Tuesday following a joint investigation by British and German authorities. The German Federal Prosecutor’s Office said the man is suspected of selling documents obtained during the course of his work to “a representative of a Russian intelligence service.” A UK government spokesman said the suspect had been “contracted to work for the government,” but British officials would not comment on reports that the suspect was working as a security guard at the embassy. The situation has prompted security concerns from MPs. Labour MP Chris Bryant, the chairman of the all-party parliamentary Russia group, told The Daily Telegraph the British government “must review the security of all contractors at UK embassies as a matter …