Twenty-six countries around the world, including the United States, have announced plans to toss out Russian diplomats in an unusually coordinated response to a nerve-agent attack in Salisbury, England, that targeted a Russian ex-spy and his daughter.
Affecting at least 150 people, it is the largest expulsion of Russian diplomats since the Cold War - and virtually unprecedented in scale and scope.
In Europe, even countries that normally pursue Russia-friendly policies, such as Hungary and Italy, joined the action as a sign of solidarity with Britain, a marker of just how disturbing they found the attack on Sergei Skripal and his daughter, Yulia.
Britain has pinned the blame squarely on the Russian Government. Most countries said they were expelling diplomats they believed were actually undercover intelligence agents.
Belgium, Ireland, Moldova and Australia were the latest to join the list of countries taking measures against Russians, and Nato also said it was kicking out seven diplomats from the Russian mission to the alliance.