Russia plans to expel British diplomats in retaliation to British Prime Minister Theresa May’s decision on Wednesday to kick out 23 Russian diplomats in response to the nerve agent attack on ex-spy Sergei Skripal, Reuters reports.

Why it matters: Russia has denied involvement in the attack, but British Foreign Secretary Boris Johnson said Friday that it is “overwhelmingly likely” that Vladimir Putin was behind it. Even President Trump, who has defended Russia in the past, said Thursday that "it looks like" Russia is the culprit.