Russia warned Britain on Tuesday it would face consequences for supplying drones to Ukraine which are used to attack targets on Russian territory.
Russia's embassy in London was responding to a report in the Times newspaper on Saturday which said British-made drones had been used for long-range strikes against Russia for the first time.
"London's actions will inevitably carry consequences for which it will have to answer," the embassy said in a statement posted on its Telegram channel.
"The deeper its involvement in the conflict and the greater its support for Kiev's terrorist machinery, the higher the price it will pay."
Ukraine has been using deep-strike drones to hit oil refineries and logistics facilities in Russia.
Britain's Ministry of Defence did not confirm whether British drones had been used.
In June, Britain said it would provide 150,000 drones to Ukraine by the end of 2026 as part of a £752 million ($996 million) funding package.
Asked about the Russian embassy comments, a defence ministry spokesperson said: "Britain stands shoulder to shoulder with Ukraine and we are committed to providing the equipment Ukraine needs to defend itself against Putin's illegal invasion."
Since the start of Russia's war against Ukraine in 2022, Moscow has repeatedly warned Britain and other Western allies that their support for Kiev, including the supply of equipment, could provoke retaliatory measures and increase the risk of a broader confrontation.
UK resolve to stand against ‘aggression’
Russia should be "in no doubt" about the UK's resolve to stand against Russian "aggression," the UK's Defence Ministry said on Tuesday, responding to Moscow's warning over London's military support for Ukraine.
Ukrainian President Volodymyr Zelenskyy held talks with Andy Burnham late last month, becoming the first foreign leader to meet the new British premier who replaced Keir Starmer. Burnham had reiterated the UK’s "unwavering" support for Kiev, telling Zelenskyy "we've got your back."
