"Both sides now crippled beyond repair, the remnants of their armies continue to battle on ravaged planets, their hatred fueled by over four thousand years of total war. This is a fight to the death. For each side, the only acceptable outcome is the complete elimination of the other."

Great style, loved the industrial design of the vehicles, poignant setting.
But, what was the thing on the ground at the end? A really uncomfortable looking engagement ring?

I cut that part from the description which I've changed now.

It's the submunition shown when the bomb casing comes apart.
"Cassette bomb submunitions became a fortress for the grass"

I guess I understand what that means in plain (bad) english, (those are their words, not yours, right?), but it's really poorly thought out and visualized if I do understand the meaning.
Still a nice animation. I wished it was longer.

It's like Wall-e, but a downer.

Berserker. Fred Saberhagen. Google it.

It was plainly obvious.

Uhm, am I the only one who still doesn't get it? What is a "cassette bomb submunition"? Those words don't seem to belong together. Still, I almost prefer the ending to be a little bit ambiguous.

Yeah, the translation is a bit awkward. I think the "ring" at the end is the casing for one of the individual cluster bombs, providing a fortress wall of sorts around a tuft of grass.

I'm with you. I know a "cassette bomb" is a lesser used term for cluster bomb through googling. Submunition i assume because it broke apart from a larger munition. I don't know why it was a fortress for the grass though, and any higher meaning seems to be lost to me. It was a nice animation about a skeleton bombing an abandoned metropolis though.

Last day of war has been added as a related post - related requested by CrushBug on that post.