Yes, from the history lessons at Russian school one can get the feeling that the largest country in the world became such by defending its fellow believers, brothers, and neighbors in trouble. Or, when repelling another aggression, it got back more than it had. If we talk about history before the 20th century, "everybody was like that at that times". Well, it is always possible to explain the war by strategic necessity, a threat from other great world powers.
But are there many countries where history textbooks condemn their country's actions in the past? I don't think there are many. Usually, condemnation occurs only in countries that were defeated and committed to national repentance, which is a rather painful condition.
There are plenty of classic justifications for the current military operation: to protect the Russian people, language and faith; to fight repugnant Nazism, the worship of Hitler's Nazi helpers, the desecration of the sacred memory of the great victory; to protect strategic interests; to counter a hostile alliance; "we did not want to, we had to"; to end a regime that spreads hatred among brotherly peoples.
To this is added the not very understandable to the average man, but very ambitious "end U.S. dominance in the world". This is apparently intended for the world community, to gather a coalition against the current state of affairs in the world order. Perhaps this is where things are best for Russia