I heard that all the Japanese restaurants in Phoenix are owned by Koreans.
This seems to be happening in a lot of places. Lots of Koreans in San Francisco's Japantown, although many restaurants are labeled as Korean eateries. I eat often at Japanese restaurants in and near SF, and it's somewhat disconcerting to see and hear the staff are filipino or Korean, although the chefs are largely Japanese (except one place where the sushi chef is white).