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 "Ken Watanabe"): To English-speaking audiences, he is known for playing tragic hero characters, such as General Tadamichi Kuribayashi in "Letters from Iwo Jima" and Lord Katsumoto Moritsugu in "The Last Samurai", for which he was nominated for the Academy Award for Best Supporting Actor.
Relevant evidence: Yes