Moscow has threatened the UK with “consequences” after reports that British drones have been used to strike targets on Russia’s mainland for the first time.

Ukraine used drones made by two UK companies as part of a so-called deep strike campaign, the Sunday Times reported.

Kyiv has stepped up its attacks on Russia this year, with long-range missiles and swarms of drones increasingly targeting military industries and energy facilities.

It has also targeted giant depots for Wildberries – Russia’s largest online retailer – burning billions of pounds of merchandise and bringing the war home to the Russian public more than four years into Moscow’s full-scale invasion of Ukraine.

Russia’s embassy to the UK said in a statement on Monday that the reports “confirm that London is deliberately opting for an escalation of the Ukraine crisis” and accused Britain of “seeking to contain Russia and inflict maximum damage on it by proxy”.

“London’s actions will inevitably carry consequences for which it will have to answer,” it added.

“The deeper its involvement in the conflict and the greater its support for Kyiv’s terrorist machinery, the higher the price it will pay.”