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ididntknow Despite the USA's misguided and mainly solo involvements in other countries' wars from Vietnam onwards, usually failing to achieve its aims,I don't believe for one moment it wants to "invade" either Russia or China! Even if it could.
As for NATO expansion only two countries have joined since the end of the Cold War - Sweden and Finland - in response to Russia invading Ukraine giving them justifiable "are we next?" fears, and
they asked to join of their own free will. Just as did Poland, etc.
"All the troubles of the world"? Hardly
I do agree that America has long thought itself the world's Number-One nation, trying to foist her own ways of politics, economics and culture onto every one else, cherry-picking their industries and cultures for herself; but is now fading. I think much of that is down to her own domestic infighting, commercial competition, and other countries fed up with the USA trying to tell them how to live.
Although presently in economic difficulties, the present Number Two country manoeuvering to be Number One - and with a strong chance of succeeding over the next few decades - is the People's Republic of China. She has a huge advantage over the USA and everyone else: a coherent, cohesive and ruthless system designed for permanency, not wavered by elections every few years, and the skill and patience to make it happen.