Britain's PM plans retaliation against Russia after ultimatum deadline passes

The spy drama gripping Britain was expected to reach a climax Wednesday after Russia ignored a midnight deadline to explain how its nerve agent was used in the attempted assassination of a former double agent on U.K. soil.

British Prime Minister Theresa May is set to announce in Parliament how she plans to retaliate against Moscow for its alleged role in the poisoning of Sergei Skripal and his daughter in Salisbury last week.

May said earlier that it was "highly likely" the regime of President Vladimir Putin was behind the attack and gave him until midnight Tuesday to provide an explanation.

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