"I make no secret of the fact that we wish to put a pro-government faction in the Duma, " the bloc's leader, Sergey Shoygu, said during the election campaign.
"We wish to determine whether those events were indicative of a pattern of behavior by agents or officers of the Secret Service, and need to be addressed systemically, or if they instead constituted an isolated incident warranting action only with respect to the individuals involved, " said the letter from Lieberman and Collins.