A sovereign state in a capitalist society is a capitalist state. A capitalist state always serves, in aggregate, the interests of the capitalist class. Karl Marx showed us how this works 150 years ago and nobody has challenged this part of his analysis to my knowledge.

I am familiar with the delusional American libertarian fantasies, but that's just ideological denial. They haven't done any actual analysis of how a government or state works, or who influences it.