In response to the UK's decision to expel 23 Russian diplomats following the poisoning of Sergei and Yulia Skripal, the Russian Federation expels 23 British diplomats, closes the British Council in Russia and closes the Consulate-General of the United Kingdom in Saint Petersburg.
The death of Russian businessman Nikolai Glushkov, who lived in exile in the United Kingdom, is confirmed by a coroner's examination to be a murder. The killing happened eight days after the poisoning of Sergei and Yulia Skripal.
Poisoning of Sergei and Yulia Skripal
The British Army Chief of the General Staff, Mark Carleton-Smith, says Russia is a "far greater threat" to the United Kingdom's national security than the Islamic State.
Investigative website Bellingcat identifies the second suspect involved in the poisoning of Sergei and Yulia Skripal as Alexander Mishkin, a doctor who works for the Main Intelligence Directorate.