So, Lugovoi is second on the federal part of the Zhirinovsky's list - he is guaranteed the spot if the party gets 7% of the vote.
BTW, got a very "Russian" idea how not to let this happen. Once the lists are finalized (they can't be changed after a certain point), it could be announced that all those who do not resign from them before the election would not be eligible for British (European, American, etc.) visas for the entire term of the Duma. To make it stronger, one could also include their family members (would be superstrong, if Turkey, Egypt and Thailand - favorite Russian vacation spots - would also go along). A lot of junior party goons, who, in any case, don't have much of a chance of gaining a Duma seat, would resign, rather than suffer the exclusion. Bingo: once a certain proportion of the candidates resign, the list may be disqualified
Not that this would ever happen, just to illustrate "how it is done in Russia".