The United States has ordered the expulsion of 60 Russian diplomats and the closure of the Russian Consulate in Seattle, over Russia’s alleged poisoning of Russian spy Sergei Skripal and his daughter in Salisbury, Britain, earlier this month. It’s the largest expulsion of Russian diplomats in U.S. history. It comes after Britain expelled 23 Russian diplomats last week. On Tuesday, following the United States’ announcement, more than 20 other nations followed suit. More than 100 Russian diplomats have now been expelled in total, which the BBC reports is the largest collective expulsion of Russian intelligence officers in history. Russia denies carrying out the nerve-agent poisoning and has promised to retaliate against the diplomats’ expulsions.