US accuses Russia of firing anti-satellite weapon in space
"Clearly this is unacceptable," tweeted US nuclear disarmament negotiator Marshall Billingslea, adding that it would be a "major issue" discussed next week in Vienna, where he is in talks on a successor to the New START treaty.
On Thursday, President Donald Trump told his Russian counterpart Vladimir Putin that he hopes to avoid an "expensive" arms race with Russia and China.
The system used to conduct last week's test is the same one that Space Command raised concerns about earlier this year, when it maneuvered near a US government satellite, said General Jay Raymond, head of US Space Command.
"This is further evidence of Russia's continuing efforts to develop and test space-based systems, and consistent with the Kremlin's published military doctrine to employ weapons that hold US and allied space assets at risk," Raymond said in a statement.
It is the latest example of Russian satellites behaving in a manner "inconsistent with their stated mission," the Space Command statement added.