Russia on Thursday ordered the U.S. to close its embassy in St. Petersburg, and said it would expel 60 American diplomats, in the latest escalation of tensions over Russia’s alleged poisoning of Russian spy Sergei Skripal and his daughter in Salisbury, Britain, earlier this month. Russia denies carrying out the nerve agent poisoning. President Trump, who defied the advice of his aides and congratulated Russian President Vladimir Putin on his recent re-election, has made no mention of the poisoning, and on Thursday, Trump did not mention the expulsion of U.S. diplomats during a campaign rally in Ohio.