What is the main problem with the international aid that was sent to Yemen in the 1990s?

The funds where diverted

Explanation:

The major problem with the international aid which was sent to Yemen in the 1990s is basically that the aid sent was not properly used to better the lives of its citizens, that is the funds where diverted and distributed majorly among those that had a certain connection to the government this caused and uproar in the country at the time.

Although there have been attempts to restructure the economy with the assistance of international agencies, Yemen's economy remains underdeveloped and appears ready to collapse under the burden of unemployment, poverty, and rapid population growth.