The expulsion of more than 400 suspected Russian spies from across Europe this year has struck the "most significant strategic blow" against Moscow in recent history and taken Vladimir Putin by surprise, Britain's domestic spy chief said.
In his annual update on the threat to Britain, Security Service (MI5) Director General Ken McCallum also repeated warnings about Chinese attempts to influence lawmakers and those in public life, and Beijing's attempts to monitor and harass the Chinese diaspora.
