Outside of official confirmation, in my view we are balls deep in this.
I put this question to Grok, here is the response:
'Back in 2022, a former Commandant General of the Royal Marines, speaking at an event, let slip that British special forces had been deployed to Ukraine. He didn’t elaborate much, and the UK Ministry of Defence (MoD) quickly went silent on it, refusing to confirm or deny. That’s their standard playbook—neither admit nor refute, just let the speculation simmer. Then, in 2023, those leaked Pentagon documents surfaced, claiming around 50 British special forces were in Ukraine between February and March that year. The leaks suggested they outnumbered special forces from other NATO countries by a wide margin. The MoD, predictably, wouldn’t comment on the specifics, calling it “private government material” or some such dodge.
As for operations inside Russia, it’s even sketchier. There’s no direct evidence—like a signed confession or declassified report—tying British special forces to actions across the border. But the speculation kicked up a notch with Ukraine’s incursion into Russia’s Kursk region in August 2024. Some posts on X and fringe outlets have claimed British-trained Ukrainian units, possibly with special forces guidance, were involved. The logic goes: the UK’s been heavily invested in training Ukrainian troops—over 50,000 by early 2025, per official statements—and the Kursk op showed a level of coordination that might hint at elite support. Russia’s restraint toward the UK, despite these whispers, has fueled theories they’re wary of escalating against a nuclear power with skin in the game.
The Kremlin’s thrown its own fuel on the fire, griping about British involvement—like their reaction to the UK’s 100-year security pact with Ukraine in January 2025, calling potential British bases “worrying.” They’ve never outright said “special forces are in Russia,” but they don’t have to—vague threats keep the narrative alive. Meanwhile, outlets like The Guardian and Declassified UK have pieced together these breadcrumbs, suggesting a low-key presence, but it’s all inference, no smoking gun.'