German chemical weapons experts have determined that he was poisoned with the Soviet-era nerve agent Novichok.
Alexei Navalny remained hospitalized in Germany after being poisoned with a Soviet-era nerve agent, a lab determined. The Kremlin has denied involvement.
A State Department spokeswoman said it had been determined that Russia “has used chemical or biological weapons in violation of international law."
The testing is part of the investigation into the Novichok deaths of Dawn Sturgess and Charlie Rowley.
Dawn Sturgess, 44, died of the same Novichok toxin used on a former Russian spy four months ago.
The pair were hospitalized after being found unwell just a few miles from where an ex-double agent was attacked in March.
Britain has accused Russia of being behind the nerve agent attack, but Russia has denied any involvement.
An international chemical weapons group's analysis confirms British tests on the poison -- and further points to Russia as the culprit.
“This is not the end of her treatment but marks a significant milestone.”
The guinea pigs apparently died of dehydration, and the cat was severely malnourished and distressed.