If you think Russia can never be trusted you'd have to say the same about the other countries failing their security obligations. Those who guaranteed Ukraines territorial integrity, the US, the UK, didn't act and send their own troops to stop the invasion.

That's not true. In the Budapest Memorandum those states only agreed to respect Ukraines territorial integrity, not defend it. In case of threat, they agreed to consult and to get the UN security council involved in case of an attack. Therefore only russia is the traitor that violated it. Even though Ukraine is not in NATO other countries go way above their obligations to help, because friends don't need defense pacts to help. However, if NATO countries get involved with soldiers, they risk losing their NATO support if russia strikes them back, as NATO is a purely defensive org and doesn't support attackers.

IMO the friendly way hasn't been tried as NATO also didn't care about how Russia feels about this and that.

That has nothing to do with Ukraine. Ukraine and others in the region didn't even consider joining NATO until after russians second attack and NATO also didn't actively try to recruit them. Everyone lived in peace, but that all changed when the Fire Nation attacked.

The story is well known.

That's russian propaganda to confuse the allied forces. Everyone sees right through it, as the russian people want the war just for expanding their country.

There's not a single country or single person to blame but many of the involved actors.

I strongly disagree, because russia did not have to start it and can still end it any time by retreating their troops back to russia. Even putin alone can stop it against the wishes of his evil citizens. Therefore, they are the only ones directly to blame.

To me it's lunacy to think Russia will be defeated and split up.

russia is already almost defeated just by Ukraine alone. They even had to beg NK for additional troops. How pathetic.

Russia has nukes.

France, UK and US, etc also have nukes. The risk of mutual destruction must be ignored, because it's not woth living in a world where villains like putin can just take whatever country they want and turn it to shit like russia, just because they have nukes. The other countries are ramping up their military as a reaction to russia attacking a peaceful nation. If russia doesn't retreat soon, the allies will likely also come to my conclusion, that russia must be defeated and split up. China will probably backstab russia once it's weakened, take a big chunk of russia for themselves and encircle Mongolia.