Sergei Skripal
The guinea pigs apparently died of dehydration, and the cat was severely malnourished and distressed.
The move, which was tougher than expected, followed Britain’s decision to expel 23 Russian diplomats over the Salisbury attack.
The move comes after Russia announced its intention to oust British diplomats.
Sergei Skripal and his daughter are still in the hospital after being poisoned by a nerve agent earlier this month.
WHAT'S HAPPENING
The two leaders agreed on the need for Russia to "face consequences."
"We offer the fullest condemnation," the White House press secretary said. But of whom she wouldn't reveal.
If Russia does not respond, British PM Theresa May said the poisoning will be considered "an unlawful use of force" against the United Kingdom.
Officials said there was no immediate health risk to anyone.
Sergei Skripal and his daughter are still in critical condition.
A counterterrorism unit has taken over the case. Sergei Skripal remains in critical condition.