It’s tough for small countries to negotiate with big countries, like any single individual is hard to fight a big company.
To protect individual employees, union is needed.
It’s the same for small countries.
It’s different from UN, which INCLUDE big counties. It’s not like BRICS etc., as China is already a super power.
It should be small countries only. And they shall work together and organize a team to fight for their rights in negotiations.
Sure this may cost some money, but the benefit shall outweigh.
They shall need to resist the attempt to make separate deals with big countries – this will undermine the coalition and bargain power collectively.