This is a classic example of how adaptable Ukraine's national instrument, the bandura, is.
The singer, Natalia Gudziy, is originally from Chornobyl. She has been living in Japan since 1999. Given the nuclear bombing of Japan in WWII, perhaps her affinity for the Japanese people and culture is not particularly surprising.
I don't know anything more about her than I could find here and here (still no Wikipedia entry on her), but I hope we'll hear more about her in the future.
In the meantime, here's another: