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, NBC News reported.
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Britain's Press Association reported after the deadline passed with no reply that May would meet with senior intelligence officials and ministers later in the morning "to discuss developments in the case." May is also likely to make another statement in the House of Commons, Press Association reported.
A spokesman for Russia's embassy in London told Reuters: "Russia will not respond to London's ultimatum until it receives samples of the chemical substance."