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Russia's ambassador has been summoned to the UK Foreign Office over the expulsion of six British diplomats from Moscow, the government has said.
A Foreign Office spokesperson accused Russia of making "malicious and completely baseless accusations" against its staff, after Moscow claimed the diplomats were engaged in spying.
A statement accused Russia of carrying out a "malicious and deliberate public campaign of aggression against the UK".
Russia revoked the accreditation of the diplomats on 13 September, with the country's secret service, the FSB, saying it had received documents indicating Britain's involvement in inflicting "a strategic defeat" on Russia.