Should the smallest and largest countries have equal votes in organizations such as the United Nations?

This is an unresolved question in my mind. Cambodia is small and poor, and its vote can be bought relatively easily by a large, wealthy nation such as China [e.g., Cambodia's vote in ASEAN holds same weight as of the larger Thailand, Indonesia, Malaysia and Philippines], just like USA buys votes at UN from small island nations in order to give the impression that it has "multilateral support" and to not look cornered.

Question arises - should a smaller nation [in terms of population, economy size, etc.] have equal voting rights as a nation with much more population [India] or much more geographic size [Russia] or much larger economic size [Japan]? Countries with few people are representative of the people of the world as whole to a very little extent [compared to China, whose people represent over 18% of mankind], yet they vote on global issues with the same voting weight as nations with hundreds of millions of people each.

Taking away this inequality has its own severe negative repercussions [demonic countries such as USA would literally eat up less mighty nations].