Director-general of MI5 has said that Britain faces a growing threat from covert attempts at destabilization by Russia.
The head of the UK's security and counter-intelligence agency MI5 has said the covert threat from foreign countries was rising with Russia showing more activity.
In an interview to the Guardian, director-general of MI5 Andrew Parker said the threat of radical Islam drew the most attention.
Russia was "using its whole range of state organs and powers to push its foreign policy abroad in increasingly aggressive ways - involving propaganda, espionage, subversion and cyber attacks," he said, in the first newspaper interview with an incumbent MI5 chief in the service's history.
"Russia is at work across Europe and in the UK today. It is MI5's job to get in the way of that."
Besides Russia's high-profile activities in Ukraine and Syria, it was also responsible for "high-volume activity out of sight with the cyber-threat," he said.
"Russia has been a covert threat for decades. What's different these days is that there are more and more methods available."
He said that Moscow "increasingly seems to define itself by opposition to the West and seems to act accordingly."