My comment:
(a) With respect to China: 威胁 is China's word, not America's.
(b) I had a posting titled ('National Military Strategy') dated July 1, which quoted Defense News as saying, "The strategy specifically calls out Iran, Russia and North Korea as aggressive threats to global peace."
However, again the term "aggressive threats" is Defense News, not America's.
(c) Searching through National Military Strategy ("Strategy"), I find
(i) the Strategy at page 2 states, "Iran also poses strategic challenges to the international community;" and
(ii) the same at page 9 says,
"In Europe, we remain steadfast in our commitment to our NATO allies. NATO provides vital collective security guarantees and is strategically important for deterring conflict, particularly in light of recent Russian aggression on its periphery."
These two instances are the most ominous the Strategy has to say about Iran and Russia--and say little about N Korea. Let alone China.
(iii) The Strategy does use "threat" or "threaten" twenty (20) times, but in vague ways (an example: "VEOs [violent extremist organizations, such as ISIL], in contrast, pose an immediate threat to transregional security") and not in the discussion of any foreign entities