Whilst you bring up some valid points about the historical context of the conflict and Russia's legitimate security interests, you fail to acknowledge the core issue of Russia’s blatant violation of international law and Ukraine’s sovereignty.
Yes, Russia suffered massive casualties during World War II, and yes, Russia has legitimate security concerns. But that does not give them the right to invade and annex a sovereign nation, no matter how sympathetic their motivations might seem.
In essence, your response tries to justify an illegal invasion by appealing to history and Russia’s fears.