Russian Ambassador to the United Kingdom Andrey Kelin was summoned to the British Foreign Office on Wednesday over Moscow's alleged "intelligence-gathering operations."

It came as the UK on Wednesday rolled out a package of measures against Russia, including the expulsion of a Russian defense attache for being "an undeclared military intelligence officer."

The UK said the Russian ambassador was summoned to be informed about the measures and "reiterate that Russia's actions will not be tolerated."

The Russian embassy in London has not yet made any comments. However, Russian media reported that the Russian Foreign Ministry will give an "appropriate response" to Britain's decision to expel the Russian defense attache.

(With input from agencies)