Every Russian leader, whoever in office, will want to reclaim the land of the USSR, it is human nature to expand one's domain. To enter into hot war is different to desire, certain red lines must be crossed and diplomacy have failed. Ukraine becoming part of EU and NATO was one of those red lines, Putin has actually said it repeatedly years before the invasion started.
Hitler wanted living space for Germans in the East, he viewed Slavs as inferior race living on land that can be used for German repopulation. Completely two different situations.
