Biggest expulsion of Russian diplomats from the UK since the end of the Cold War.
In-depth reporting and analysis from a global perspective. 23 'undeclared intelligence officers' given a week to leave the country.
23 "undeclared intelligence officers" given a week to leave the country
Democrats claim victory in key congressional special election
Researchers find particles of plastic in some of the most popular brands of bottled water
And a tribute to the renowned physicist Stephen Hawking, who's died aged 76.