(1) Like you, I am waiting for a teacher (or knowledgeable non-teacher)
to answer you.
(2) I learned a lot from your question. It really made me think.
(3) My only contribution to this discussion is to gently, timidly, humbly
suggest that perhaps (as you indirectly pointed out) the writer was
wrong to use the verb complain.
(4) Maybe the sense of the sentence actually is something like:
Some officials demanded/recommended/ suggested that the United States
(should) resume a leading role.
Student or Learner