Why would you rely on another nation for defense infrastructure? It makes zero sense for Europe to rely on starshield in the first place.
That said, a lot of people use nation state as a synonym for sovereign state, and Belgium is as much a sovereign state as the US is.
There are many other countries in Europe (and outside of it) that are multi-lingual and for the most part having a single language is not a core requirement for being a nation state.
Belgium has been independent for almost 200 years, and is one of the founding members of the the UN. In what possible way is it not a nation state?
Nonetheless, even today, the vast majority of countries are not self-sufficient on defense infrastructure, and this has been true for most of the modern era. The most obvious deficiency is in naval terms: the number of countries who have enough of a navy that they can do something about "my shipping is being attacked by pirates" without help from other people is plausibly at most five (US, UK, France, Russia, China), and I have my doubts about half of those.
The UK signed an agreement with the US to supply research for the Manhattan Project, in the naive belief the results would be shared.
The US said "Nuh uh - that's classified" and the UK had to develop its own program from scratch.
Then the US lobbied to have that thrown away so the UK would be locked into Polaris and then Trident.
And so on. NATO has very much been a showroom for US arms sales, and competition has been discouraged - not always effectively, but the implied pressure has always been there.
It's been more carrots than the (non-zero) sticks.
I think it's under selling Europe's agency to characterise the relationship as 'forced'.
And now that the US is increasingly seen as unreliable, Europe is (slowly?) decoupling - which is what you'd expect as a mutually beneficial relationship sours.
Powerful people got together and decided the world would be a nice place if everyone worked together. Their solution for ensuring that happened whilst taking human behaviours into account was global capitalism.
Despite its downsides (some of which we're only starting to see the consequences of) you have to admit that it was doing its job. Countries were cooperating because it was in their best interest. It was always a delicate thing though, and the orangutang broke the trust it relied on.
It might seem naive now, but "bro, of _course_ you can rely on us for service X, why are you even asking?" was an believable response before the orange.
Because, yes, you get E2EE by having the operator do the encryption :facepalm: