Question: This japanese actor lent his voice to the fourth and fifth installments of the "Transformers" franchise and was in a  2006 Japanese-American war film directed and co-produced by who?
Sentence (from "Letters from Iwo Jima"): Letters from Iwo Jima (硫黄島からの手紙 , Iōjima Kara no Tegami ) is a 2006 Japanese-American war film directed and co-produced by Clint Eastwood, starring Ken Watanabe and Kazunari Ninomiya.
Relevant evidence: Yes