He invaded a sovereign, independent country with no provocation and is responsible not only for the deaths of Ukrainian people but his own troops for such a reprehensible, calculated act. He's not the only one guilty of war crimes and mass murder in this event, those like Lavrov and all in this abhorrent regime share responsibility for this atrocity. There's nothing "justified" about this invasion whatsoever or any of the killing. It's murder as simple as that.
The problem with the above is that Putin himself says all that about the US invasion of Iraq.
But we were NEVER 'one step closer' to WWIII. That's the difference.
Sure, nukes changed the theater of war and have been the most dangerous threat of global annihilation since their inception, no disagreement there.
Don't 'undersell' them, they are THE threat of global annihilation.
The American constitution doesn't protect the rest of the world either. The NATO alliance does or tries at least.
How about the UN?
The problem with the UN and NATO and with the US before the Civil War is that you don't have to be in it. Once it's 'for keeps', then that's a nation with a single regime, that's the One World Order. People 'want it both ways'. But 'both ways' has now provided us being once again, 'one step closer' to nuclear WWIII. We thought we had 'fixed' it in 1991 with the Soviet regime's collapse, but we were wrong.
Don't make excuses for this despots actions however, he knows fine well what he's doing, he's been planning it long enough. He and those associated are mass murdering thugs who deliberately lie to their own people.
Whether that's true or not doesn't alter our plan. I don't want emotions to cloud our judgment. We don't need them anyway in order to do what we need to do, it's 'cut and dried', plain as day. We need a 'one world order' so that nukes are always under democratic control----somehow, we must do this. Nukes = not playing around.
==Edit
Nukes are a threat because of enemies. With one world order there will be no more enemies, so there will be no more threat of nukes. We can just use them to defend our planet from like asteroids or aliens or whatever, but we'll never again have to deal with the threat of any human using nukes against other humans, ever again for as long as humans exist.