The new head of MI6 will warn in her first major public speech of the growing threat of Russia and the need for spies to master technology to deal with increasingly complex threats.

Blaise Metreweli will say the “front line is everywhere” as she sets out her understanding of the global security landscape in a speech at the headquarters of Britain’s foreign intelligence service.

Ms Metreweli, appointed head of MI6 in June, is expected to speak of the threat posed by an “aggressive, expansionist and revisionist” Russia.

She will say: “Putin should be in no doubt, our support is enduring. The pressure we apply on Ukraine’s behalf will be sustained.

“The export of chaos is a feature, not a bug, in the Russian approach to international engagement, and we should be ready for this to continue until Putin is forced to change his calculus.”

Threats from across the globe are increasingly intricate, the spy chief will say, including sabotage, technological disruption, and disinformation.