Does Russia not want to annex parts of the Ukraine? [closed]

The idea of this question arose when in Germany, vice admiral and chief of the German Navy Schönbach had to leave his position. Among other things, he had said that the Crimea will not come back (which accepts the annexation of Ukrainian territory) and after this, he said that it was nonsense to say that Russia wanted to annex parts of Ukrainian territory (link to the talk).

This question is not about judging upon this logically or about the internal motivations of this vice admiral. I am just curious. How could this be historically or politically right that Russia might not want to annex parts of the Ukraine even after the Crimea occupation and the further rather aggressive steps?