The story of how, for a brief period of time, an island controlled by Russia became an official part of Japan.
How Japan's discovery of a large northern island devastated the island's native population - and how Japan lost control when Russia muscled in.
After all these years, the Japanese government officially recognized the Ainu. Here's why the Ainu can't take them seriously.
How a mysterious frontier island peopled by "barbarians" became one of the four main islands of Japan - and how the original inhabitants suffered as a result.