Factbox-The threat horizon according to Britain's MI5 spy chief Reuters | Jul 14, 2021 08:31 PM EDT MI5 Director General Ken McCallum is photographed in London, Britain (Photo : UK Government/Handout via REUTERS) Britain's top domestic spymaster cautioned the population on Wednesday to treat the threat of spying from Russia and China as vigilantly as terrorism, warning that foreign agents were seeking to steal technology, sow discord and attack infrastructure. Following are the key threats as seen by Security Service (MI5) Director General Ken McCallum: Advertisement RUSSIA, CHINA, IRAN - They carry out cyberattacks. - Their spies seek malign influence by targetting ordinary British citizens and spread misinformation.