I see this as a possibility, but the most important thing for Russia is to destabilize Ukraine. The important part that Russia wanted was Crimea, and they have it for now. The international community has adopted sanctions, but is doing nothing to turn the situation around.
Does Russia want to expand its territory further? It's a possibility, but I think it's minor. What Russia absolutely wants is to destabilize Ukraine so that it does not become democratic. As long as the conflict is at Ukraine's doorstep, Ukraine won't be able to join NATO. In this sense, Russia is achieving its objective, in my opinion.