Focus on "unbelievably cruel" nerve agent used in attack on ex-spy

President Trump joined British Prime Minister Theresa May in calling for Russia to come clean about the poisoning of a former spy in England. That came as another Russian turned up dead in London.

The body of Russian exile Nikolai Glushkov was discovered Monday night, less than two weeks after Russian ex-spy Sergei Skripal and his daughter were poisoned by a military-grade nerve agent made in Russia.

Glushkov was an opponent of Russian President Vladimir Putin, and joins a list of 14 other Russians who have died on British soil -- some under mysterious circumstances -- and whose cases are now being reviewed.

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