The Kremlin today said it could respond to Britain's expulsion of Russian diplomats over the poisoning of a double agent "at any minute".
Retaliation would be "well thought out" and could come at any time, Kremlin spokesman Dmitry Peskov told journalists when asked if Moscow would respond to the measures before a presidential election on Sunday.
"Sooner or later the British side will have to present some kind of tangible evidence. Sooner or later we will have to move into the area of supported accusations, and not just insinuations," he added.
"We do not see that yet."