Netflix's new spy thriller "Treason" follows Charlie Cox's Adam Lawrence, an MI6 agent accused of betraying his own country when his past catches up with him.
"Putin, and this is the great irony, is in danger of being outflanked by the very political constituency he created," said former head of MI6 Alex Younger.
Sir Richard Dearlove does not believe Putin will be able to enjoy a "luxurious retirement" despite the massive wealth some believe he has accumulated.
Sir Richard Dearlove said that Nikolai Patrushev, the secretary of Russia's Security Council, would be a likely replacement for the longtime Russian leader.
The former British intelligence officer said the peace talks between the Russians and Ukrainians were not likely to prevail while Putin is still in power.
MI6 Chief Richard Moore said China, Russia, Iran and international terrorism were the U.K.'s "big four" security issues, with China taking the No. 1 spot.
Sir Richard Dearlove said it would likely be "difficult to prove" that the Wuhan lab in China was behind the leak.
The president has threatened to declassify documents related to the Justice Department's probe into Russia election interference.
"Between us, we have spent close to 90 years imprisoned without charge or trial," the letter says.
Convicted Russian spy Sergei Skripal's "substance exposure" is drawing comparisons to the 2006 death of Russian intelligence agent Alexander Litvinenko's acute radiation poisoning.
A Spanish double agent did everything he could to stop his wife from blowing his cover.
International cyber crime groups are advancing faster than agencies can put up defenses.
John Sawers and Jonathan Evans write that a withdrawal vote would hurt the EU and leave Britain vulnerable.
Former CAPO agent Uno Puusepp has been unveiled as a double agent for Russia's FSB
Britain's security services have for years been accused of colluding in the ill-treatment of suspected militants.