>>/46713/
1. They entered Ukraine.
2. They went until they found resistance.
3. There they got engaged by the Ukrainians.
4. They stopped. Maybe initiated recon by force form different directions to see the different levels of resistance.
5. They started the artillery strike to soften the places of resistance.
6. They started the attack.
Or maybe not. It looks like it.
>>/46715/
That is not a bad idea. NATO could send troops as volunteers.
I know Croats had international brigade during the Yugo wars - I'm not adding this as a comment on NATO involvement, just something I remembered.