Amur tigers regularly prey on young bears and adult brown bears
Reports of preying on fully grown female adult Ussuri brown bears are common as well
Predation by tigers on denned brown bears was not detected during a study carried between 1993 and 2002.
Ussuri brown bears, along with the smaller Asian black bears constitute up to 40.7% of the Siberian tiger's diet
アムールトラはヒグマを定期的に捕食する。ヒグマがトラを捕食したことはない。ヒグマとクロクマはトラの餌の４０％を構成する。ヒグマ１８％になる。
http://en.wikipedia.org/wiki/Siberian_tiger

つまりアムールトラを放流すれば熊害が減る