Two basic realities:
- It's not just Russia's money in this buy-votes game. It's also China's money, and they have been investing in spades for some time now.
- Most voters in the West are opposed to foreign aid in all its forms, and do not care about the UN votes or other policy outcomes it buys.
Western voters will not vote for what is necessary to carry votes in the UN any more than they would vote for FIFA if given the chance. The UN and FIFA have the same basic governance structure, with the same problems. It's neither one-man-one-vote nor one-dollar-one-vote, and in very skewed degrees with respect to both, so we should expect the latter to attempt to take advantage of the former.