BRICS is Russia wishing that China (much less Brazil, Egypt, Ethiopia, India, Indonesia, South Africa, and the United Arab Emirates) were aligned to its interests.

A more accurate description of the way the world is trending:

US / UK / Europe / Japan / South Korea (still tied by defense, if push really comes to shove) vs Russia vs China vs Non-Aligned Nations (India, Indonesia, Egypt, Bangladesh, Pakistan, Ethiopia, Nigeria, etc.)

And historically (1960s), in a multi-polar world, middle powers are best served by being ambiguously aligned to force advantageous courting by major powers.

Then have a look who is supporting whom with weapons, which militaries are running maneuvers together, who is cooperating - or not cooperating - economically, who is visiting each others' summits, etc.

It's true that many countries are trying to have relationship with both sides or are trying to keep all options open - which is the most reasonable strategy, I think - but there are still two power centers emerging between which those countries are aligning themselves.

Well, China, Russia, Iran, and North Korea seem to have a (fairly loose) "alliance of convenience" at the moment. "The enemy of my enemy", more or less.