Joseph Stiglitz wrote an excellent opinion piece today about the World Bank's new strategy against corruption. One quote stood out (but I encourage you to read the whole thing):

Third, the World Bank's primary responsibility is to fight poverty, which
means that when it confronts a poor country plagued with corruption, its
challenge is to figure out how to ensure that its own money is not tainted and
gets to projects and people that need it. In some cases, this may entail
delivering assistance through non-governmental organizations. But seldom will it
be the case that the best response is simply to walk away.