Arrival of Donald Trump had big impact on world economy with BRICS was trying to have few things for their own interest, but tariff hits them badly now all are tying to manage things on different way while China and India has never been good coalition, but Russia presence give them some confidence.
Next summit which is going to hold in Río de Janeiro is important because now they need to work on some solid things which give them benefits currently lack of confidence and solid strategy hurting them badly I am not positive about their future as this organization is also going like many around without having anything positive for regions and countries.
India and China big players while Russia and Brazil are also good they can do but how its also important China is now standing tough again USA, but India will never do like them because they have their own way of dealing things on both sides.
For other countries it is difficult to fight the United States because they do not have the strong resources like China so the potential to fight back can have an impact on the tariffs that apply. China stood alone to fight Trump's tariffs and they realized that this could have an economic impact but China's strategy in defending itself can be said to be quite effective because they managed to calm it down and make some policies that are quite beneficial.
India is not an economically strong country and fighting back can be a problem for them and vice versa for other countries that join BRICS because economic warfare will be much more impactful when they do not have good resources to fight.