You're reading: Deutsche Welle: Why are Russia and the West allowed to spy on each other?

At least 25 countries have joined the UK in expelling Russian diplomats in response to the nerve agent attack on former Russian double agent Sergei Skripal and his daughter in the English city of Salisbury earlier this month.

The UK is convinced agents backed by Russia were behind the attack. Its allies in the European Union and NATO appear to agree.

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