The Russian search engine, Yande, have just released their map API to website developers. Yandex Maps includes a variety of maps and satellite images, including the most detailed online maps of the world in Russian. Yandex also includes detailed maps of Russian and Ukrainian cities.

The full press release can be found on the Yandex website, here:

http://company.yandex.com/press_center/press_releases/2008/2008-11-13.xml

Note: The API documentation is in Russian.