Huskohi - Tumblr Posts
Very informative & helpful to reestablish these ties. I hope to help others reconnect in these modern times.
Indigenous People of Sakhalin
There are three main groups of indigenous people on Sakhalin. They are the Nivkhs (also knows as Gilyaks), Oroks, and Ainu.
The Russians on Sakhalin had the most contact with the Nivkh people and traded with them and even employed them to capture escaped convicts.
Being from the southern part of the island the Ainu were much more tied to the Japanese and the Ainu on Sakhalin came to rely heavily on Japanese trade and especially on rice. Thus when the Japanese left Sakhalin, many of the Ainu left as well. The remaining Ainu were later forcibly removed by Russia.
Orok people had the least to do with the Russians or Japanese. They lived the furthest north, away from established settlements, and their economy was centered on herding reindeer.

A group of Orok women.

Nivkh/Gilyak men wearing parkas. (Not unlike the parka Yuuri is wearing in Chapter 4.)

A group of Sakhalin Ainu.
What started with ethnic tensions, could turn into this turbulent time. Nowadays, the previously unsafe becomes a pleasant vacation spot. Please watch this & another documentary titled «Sri Lanka's Killing Fields» to get both sides.
Lies Agreed Upon
If you really want to know more Sri Lanka and the terrorism that overshadowed it for the past 40 years, and a bit more about Sri Lanka, take the time to watch this documentary.
A Few Native Taiwanese (Formosan) Chronicles
Here are some bits about them & possible polities around in pre-Qing times. https://insight.ipcf.org.tw/en-US/article/61
https://insight.ipcf.org.tw/en-US/article/62
https://insight.ipcf.org.tw/en-US/article/63