The US and UK have accused Russia of testing a weapon-like projectile in space that could be used to target satellites in orbit.
The US State Department described the recent use of “what would appear to be actual in-orbit anti-satellite weaponry” as concerning.
Russia’s defense ministry earlier said it was using new technology to perform checks on Russian space equipment.
The US has previously raised concerns about new Russian satellite activity. But it is the first time the UK has made accusations about Russian test-firing in space. They come just days after an inquiry said the UK government “badly underestimated” the threat posed by Russia.
Russia, the UK, the US and China are among more than 100 nations to have committed to a space treaty that stipulates that outer space is to be explored by all and purely for peaceful purposes. The treaty adds that weapons should not be placed in orbit or in space.