CIA Director John Brennan says President-elect Donald Trump "needs to be wary of Russian promises" because they have often failed to deliver.

In the first interview by a CIA director with the British media, John Brennan outlined a number of areas where he said the new administration needed to act with "prudence and discipline" - these included the language used regarding terrorism, relations with Russia, the Iran nuclear deal and the way in which the CIA's own covert capabilities were employed.

Produced by Daniel Fisher, filmed by John Landy and Ron Skeans, edited by Franz Strasser.