Boris Johnson is set to deliver a warning to the Kremlin to cease cyber attacks against the West, telling his opposite number in Moscow that Britain is ready and able to retaliate in kind.
The Foreign Secretary will tell Russian counterpart Sergey Lavrov that the UK has no malign intentions online, but possesses sufficient capability to serve as a deterrent to potential cyber-aggressors.
His comments came weeks after Theresa May accused President Vladimir Putin of using cyber-espionage and disruption to sow discord in the West, warning Moscow: “We know what you are doing. And you will not succeed”.
And they follow GCHQ’s revelation on Wednesday that Britain has developed sophisticated cyber weapons capable of crippling a hostile state.
Parliament’s Intelligence and Security Committee was told the agency was developing a “full spectrum” of cyber weaponry.
Mr Johnson is the first UK Foreign Secretary to visit Russia in five years, after a period in which Moscow’s relations with the West have been plunged into the deep freeze by the illegal annexation of Crimea and alleged use of social media to influence democratic elections.
Speaking to Mr Lavrov in Moscow, the Foreign Secretary will make plain that his visit does not represent an attempt to return relations to “business as usual”.
But he will also say he wants the kind of mature dialogue between the two permanent members of the UN Security Council that will allow them to work together on issues of mutual interest such as preserving the Iranian nuclear deal, pushing forward a political settlement in Syria and countering the threat to global stability from North Korea.
Speaking on the eve of the meeting, Mr Johnson left no doubt Britain had made preparations to respond to continued misuse of cyberspace.
“Over the last year or 18 months we have fully taken on that argument,” he told reporters.
“The UK is certainly prepared and able to respond should we so desire.
“I can assure you that the UK is a world leader in this field. We don’t conduct malign or disruptive cyber activity, but the logic of deterrence is clearly something we appreciate in the cyber field. “That is something we have acquired and are acquiring.”
Mr Johnson said relations between the UK and Russia “haven’t been so bad for a very long time”.
Boris Johnson heads to Moscow (Stefan Rousseau/PA)
“There are areas in which Russia is behaving in a more hostile way towards our interests than at any time since the end of the Cold War,” he said.
“I will make clear to Lavrov that there are things that we find extremely difficult to accept, and we can’t accept.”
The occupation of Crimea, continuing destabilisation of eastern Ukraine and the western Balkans and attempts to influence democratic processes in the West are all “obstructions in our relationship that can’t be ignored”, he said.