MOSCOW, March 28, 2018 (Reuters) - Russia will definitely retaliate for the expulsions of Russian diplomats by multiple Western and east European governments, but will do so at the appropriate time, Kremlin spokesman Dmitry Peskov said yesterday. The diplomats were expelled over the poisoning in Britain of former Russian spy Sergei Skripal and his daughter. Britain alleges Russia was to blame, but Moscow says it had no involvement. Peskov gave no details on what Russia's response would be, but said it would correspond to Russian national interests. He said he hoped states that expelled Russian diplomats would look hard at the information which Britain says is evidence of Russia's involvement in the poisoning. The Russian Foreign Ministry yesterday demanded London prove British spies did not poison a former double agent in England, saying in the absence of such proof it would regard the incident as an attempt on the lives of Russian citizens. "An analysis of all the circumstances ... leads us to think of the possible involvement in it (the poisoning) of the British intelligence services," the foreign ministry said in a statement. "If convincing evidence to the contrary is not presented to the Russian side we will consider that we are dealing with an attempt on the lives of our citizens as a result of a massive political provocation."