[snozolli]

The strong reason for this attack was Russia's security concerns got ignored and stepped on by a military alliance (NATO).

NATO is a defensive pact. Putin invaded Ukraine because he wants their port, arable land, and because he wants to go down in history as "reuniting" the Russian empire. Also, Russia has wanted to exterminate the Ukrainian cultural identity, which they've tried to do since before the Soviet Union:

https://www.atlanticcouncil.org/blogs/ukrainealert/russias-i...

Putin's whining about NATO is pure bullshit propaganda. Just like his claims of Nazis in Ukraine. It's all fiction, where he writes Russia as the victim.