UN is basically USA on steroids - it was started by Eleanor Roosevelt after her husband died - but he often talked about it with her. But, USA is no longer the sole (post-WW2) hegemon.

BRICS is now a major challenge for UN, as it is gathering countries to join at lightning speed. Each conference has more deals between countries, and more countries are eager to join. The difference is that countries remain sovereign, and can use their own currency, unlike the UN, which want to dictate what countries should and should not do (e.g. universal vax), and impose a global (digital, tracked) currency - LOL, as some countries behave differently regarding currency, and have different needs - just look at the Euro - it impoverishes those who are otherwise careful with their dosh in favor of car-wreck economies - and it doesn't 'help' anyone but Ursula.

In any case, I believe the US should humbly join BRICS, and keep their dollar if they can.