The US must own major shares in EU weapon manufacturers. They knew the war was coming at the latest when Biden warned about it, but more likely when Russia sent the green men or even earlier. They will get their share.

The big picture is that China is taking over all markets and the EU is compensating by creating demand. It also creates the opportunity to go to war with China.

From an American perspective, the more Europe builds its own capacity the better because everything will be needed to fight China.

Trick question because I think we are fighting for the US.

The usual link:

in the meantime, it is imperative that no Eurasian challenger emerges, capable of dominating Eurasia and thus also of challenging America

https://en.wikipedia.org/wiki/The_Grand_Chessboard

We are past that opportunity but the EU and Russia could have formed an economic union and could have become that challenger.

Instead China is about to become that challenger. The US cannot isolate China if Russia is delivering all necessary resources. So the US is using the Ukraine war to weaken Russia to change that somehow.

Buying the weapons is not a problem. Buying government bonds was the way of the EU to finance the US government weapons programs. With tariffs that has shifted to direct purchases.

So to the EU it looks like we just defend Ukraine. But the big winner is the US because they achieve their long-term goal, which turns the with into a for.

Trump and Pentagon decided to not honor the deal.

That's one weapon system. It doesn't change that the US is still a, or even the major weapon supplyer.

The rockets were more urgently needed in the middle east. The US can be blamed for many things but that decision is understandable.

USA has once again shown they are not a trustworthy ally,

No doubt about that.

There's an old saying in Tennessee—I know it's in Texas, probably in Tennessee—that says, 'Fool me once, shame on...shame on you.' Fool me—you can't get fooled again."

To know the history of the US and to expect to be treated differently than the Philippines is a risky move.

Furthermore, the EU won't be stable for long. If Russa and China are eliminated, what will the EU be for the US strategically but a challenger?

https://en.wikipedia.org/wiki/The_Grand_Chessboard

Before they were paid in mining rights https://en.wikipedia.org/wiki/Ukraine%E2%80%93United_States_Mineral_Resources_Agreement and Germany buying US government bonds.

After the tariffs, they don't want a trade deficit, so the money is spent directly.

The war is still coordinated from their base in Wiesbaden. (German) https://www.hessenschau.de/politik/nach-trump-ankuendigung-wiesbaden-vorerst-nicht-von-us-truppenabzug-betroffen-v1,kein-truppenabzug-in-wiesbaden-100.html