Nations involved in conflicts don't typically invest in drought relief efforts because

They are more concerned about the conflict than any agricultural or land process. Moreover, those periods, it's really dangerous to embark on such, you could be a prey to the oppostion

Explanation:

During conflicts, there is a major instability across nation's involved. The economies are affected badly and there is little or no time for investment in agriculture, tourism or even restoring degrading landscape. Every party involved in the conflict are more concerned in those moments about security before other things, until it's not sorted out, other aspects may not be given priority