Is it acceptable for Musk to threaten another country?

On Monday, Musk started a poll asking X users to vote on whether "America should liberate the people of Britain from their tyrannical government". Quote from BBC news.

Now, if someone on here asked that we could pass it off as a joke. But Musk is a powerful man with a government position who has the ear of the president. He's already shown support for far right extremists here, including ones with criminal records for violence.

To me, this sounds like a direct threat to another sovereign state, and given his status, one that should be taken seriously. If Putin announced that we'd put the military on high alert.

So is it time Musk made a grovelling apology and has his bottom smacked by the American diplomatic service and told to stop beinga manchild?
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Is it acceptable for Musk to threaten another country?
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