It is a rather long list. If I remember correctly, there is something like a hundred names on it. As for the black list, I truly don't know anything about it. There is only an official list. Of course, this is a small world and the search for him will be certainly carried on.
Some states have a well-oiled system of searching for and neutralising terrorists.
I think the corresponding Russian services have established contacts and are collaborating with them. Different methods could be used to detain and neutralise such people. And of course, since the possibility of direct presidential rule or the state of emergency is being discussed before the elections the representative and executive authorities are pondering different formulas, I think this question should be tackled in practice after the elections. But direct presidential rule should be discussed yet, because there is no legal mechanism or legal norm stipulating the introduction of such rule, which means that it could be introduced by a presidential decree or corresponding law, unless other decisions are made in accordance with the situation.