A Kremlin adviser has warned that British factories producing drones for Ukraine could become targets of attacks by "unknown sources" after the U.K. agreed to provide Kyiv with classified information needed to manufacture long-range missiles, Al Jazeera reported Tuesday.

Andrei Fedorov, a former Russian deputy foreign minister and Kremlin adviser, said Tuesday that he could not "100% exclude" the possibility of "semi-military" action against Britain after Prime Minister Andy Burnham visited Kyiv on his first overseas trip since taking office.

Fedorov made the comments during an interview with the BBC, saying Russia could respond to Britain's increased military support for Ukraine with cyberattacks, political measures, or attacks on British defense-related businesses.

"There might be different political steps, and I cannot exclude 100% that there might be some semi-military," Fedorov said.

Asked what that could mean, he pointed specifically to British companies producing drones for Ukraine.

"For example, something might happen with enterprises, with the factories which are producing drones for Ukraine," he said.

When asked whether he was suggesting Russian attacks on factories in Britain, Fedorov said such facilities could be attacked "not by Russia" but "from unknown sources."

The warning came after Burnham announced during his visit to Kyiv that Britain would allow European defense company MBDA to declassify information about British-made components used in the SCALP missile, the French version of the British-French Storm Shadow missile.

The decision is intended to help Ukraine and France establish local assembly lines for the long-range missile and expand Ukraine's ability to produce precision-strike systems domestically. The British government said the missile technology would strengthen Ukraine's long-term defense capabilities.

The SCALP, known as Storm Shadow in its British configuration, is a long-range cruise missile designed to strike heavily fortified, fixed targets. It has already been used by Ukraine against targets inside Russian territory.

Russia has condemned the move as evidence that Britain is becoming directly involved in the war.

Kremlin spokesman Dmitry Peskov said Monday that Britain was "participating in this war" through its military support for Ukraine and accused London of adding "fuel to the fire."

Burnham rejected the characterization, pointing to Russia's invasion of Ukraine as the cause of the conflict.

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