It would certainly be unwise (though not atypical) to issue warnings or declare "red lines" in a situation where the US is clearly not prepared to intervene. If you actually read the article, though, it seems mostly a case of bad headline writing: the National Security Adviser's statement is neither warning nor threat, and should not have been described as such.
Can't imagine what anyone would want or expect the US to do about it in any event.
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