The head of the UK's space directorate, Air Vice Marshal Harvey Smyth described the projectile as something with "characteristics of a weapon", which Russia used during a test of its satellite.
Smyth's statement also says that such actions are a threat to the peaceful use of space.
Besides, the British military official urged Russia to keep up with constructive cooperation with the UK and other partners to promote responsible action in space.
It's the first time that the UK has accused Russia of testing weaponry in space; the statement followed just days after the report by British intelligence, which claimed that the Cabinet badly underestimates threats coming from Russia.
The American side claimed that the tests were performed on the same Russian satellite system that maneuvered near the U.S. satellite in early 2020.
"In this latest incident, Gen Jay Raymond, who heads US space command, said there was evidence Russia "conducted a test of a space-based anti-satellite weapon". Gen Raymond added: "This is further evidence of Russia's continuing efforts to develop and test space-based systems and [is] consistent with the Kremlin's published military doctrine to employ weapons that hold US and allied space assets at risk", reads the story.