U.K. gave Putin a midnight deadline to explain spy attack. What's next?

Boycotting soccer's World Cup, seizing oligarchs' mansions and even invoking NATO's collective defense clause: British Prime Minister Theresa May has a range of options to retaliate against Russia for the poisoning of an ex-spy on U.K. soil.

On Monday, May said it was "highly likely" that the government of Russian President Vladimir Putin was responsible for the poisoning Sergei Skripal , a former Russian double agent who passed secrets to the U.K., and his daughter, Yulia.

May then gave Russia until midnight Tuesday to explain why a Soviet-developed nerve agent was used in Britain.

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