Brazil isn't as invested in BRICS as China is. China and Russia hope to use BRICS to create a second IMF and a new world reserve currency. China can't let Russia be defeated because its governme t would collapse, which would bring about substantial and unpredictable changes in Russia- which China really doesn't want. China needs the war over quickly and sanctions removed to get Russia back on track. The longer the war drags on, the more problematic this becomes for China.