"We would like to know what exactly the British side did to comply with its international obligation under the Vienna Convention on Consular Relations and the bilateral Consular Convention, and what were the reasons for such a unfounded conclusion," the embassy said.
Daughter of poisoned spy in Britain turns down Russian help →
The Russian Embassy in London said the expulsion of diplomats was "totally unacceptable, unjustified and shortsighted."
U.K. expels 23 Russian diplomats over spy poisoning →
