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David Martin, DW: Why are Russia and the West allowed to spy on each other?
The expulsion of Russian diplomats from the UK, US and several other NATO states has cast a light on the world of espionage. DW looks at why spies are allowed to even operate in a targeted country in the first place.
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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WNU editor: The intelligence agencies are also used as back-channels.
