The Okhotsk microplate is a proposed minor tectonic plate covering the Kamchatka Peninsula, Magadan Oblast, and Sakhalin Island of Russia; Hokkaido, Kantō and Tōhoku regions of Japan; the Sea of Okhotsk, as well as the disputed Kuril Islands.
https://github.com/davepinch/pinchy.cc/blob/master/content/topics/places/techtonic-plates/okhotsk-microplate/en.wikipedia.org.md