Do you really believe Europe would devolve into actual internal warfare, without the US? What about the EU? I believe it has successfully kept the peace ever since its predecessor, the European Coal and Steel Community (ECSC) was created - specifically to avoid another war.
Your example is very on point: the member states are talking - not fighting - to protect their own interests.
Your example is very on point: the member states are talking - not fighting - to protect their own interests.