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Russian diplomats leave Washington. Video, 00:00:33Russian diplomats leave Washington

Aeroflot plane in deepening Russia-UK row

Russia expels more UK diplomats in spy row

Russia asks to visit Yulia Skripal in UK

New Russia expulsions escalate UK spy row

How big is the Kremlin's diplomatic network?

Russia expels one Irish diplomat

Russia expels US diplomats in tit-for-tat

Ex-spy's daughter 'conscious and talking'

The police, the public and the poison

Sergei Skripal: Who is the former Russian colonel?

Science In Action. The Rise of Novichok Agents. Audio, 27 minutesScience In Action

Spy's front door focus of poisoning probe

Poland buys Patriot missiles for $4.75bn

Funds for spy poisoning police response

Skripal niece: 'I'd really like to know how they are' Video, 00:01:05Skripal niece: 'I'd really like to know how they are'

Salisbury gets £1m aid after spy attack

Nato slashes Russia staff after poisoning

When is a diplomat really just a spy?

Dublin to expel Russian diplomat

Eurovision-style scoring or new Cold War? Video, 00:01:34Eurovision-style scoring or new Cold War?

Russian media accuse West of 'crusade'

Salisbury: 'What are the rules now?' Video, 00:01:39Salisbury: 'What are the rules now?'