The European Pine Marten (
Martes martes)
European pine marten kits.
The European pine marten is distributed throughout most parts of Eurasia. Although it was widespread in Britain, it is now restricted to Ireland and northern great Britain. It is a skillful treetop hunter, racing on thin branches and leaping from one treetop to another in pursuit of squirrels and other prey. They also forage on the forest floor. They will often den in abandoned squirrel nests and birds nests, rocky crevices, and underground.
The Japanese Marten (
Martes melampus)
Forgive the shitty picture. That was the best one I could find of this species. :/
The Japanese marten is found in Japan and in Korea. I couldn't find out much else about that would interest you.