Key moments in the case of former spy Sergei Skripal

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'Russia retaliation against UK is futile,' says Boris Johnson

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Polls open in Russia as Putin eyes 4th presidential term

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Russia boots 23 UK diplomats in spy-poisoning tit for tat

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In tit-for-tat move Russia expels 23 British diplomats

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Russia expels 23 British diplomats in escalating spy dispute

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Kremlin furious as Britain blames Putin for ex-spy attack

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May needs to follow the money to hold Putin's cronies to account

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US, France and Germany join Britain in saying Russia likely responsible for chemical attack against former spy

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Russian spy: Theresa May visits Salisbury after 'brazen' attack

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France, Germany, UK, US blame Moscow for ex-spy chemical attack - joint declaration

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May's modest response to Skripal attack will not deter Russia

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