It’s a Japanese island occupied by Russia. Most, but not all Japanese were ethnically cleaned from the territory. So it could be a Jap, a Muzzi, or just a crazy Russian.
According to the Wikipedia article, the Japanese claimed the island in the early 1800s but only controlled the whole island briefly in the 1920s. From 1905 to 1945 the southern part of the island, including the city where this killing took place, was Japanese (the Japanese name of the city is Toyohara).
See my 23. Apparently, a neo-pagan. So it is a consequence of 70 years of atheist indoctrination, but not atheism as the proximate cause.