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> any sovereign country, can join whatever alliances it wants too unless you're Cuba, or Vietnam, or Nicaragua, or Chile, and the list goes on but yes, in theory you're right; in practice history shows that if they are small and powerless then they cannot, not without consequences |
The US was invited into South Vietnam to help defend them against an invasion from North Vietnam. We can debate the morality of the resulting war, which was questionable, but it was not a US invasion.
The US invasion of Nicaragua was in 1912, long before the modern post-WWII era of stronger international law.
Chile was not invaded by the US.
If these are the examples you have, you don’t have a strong argument.