Where will the food come from? Importing it from elsewhere provides plenty of its own problems with trade and shipping. It is a limited resource anywhere, with priority to the native population. But, leaning on the adage "give a man a fish, feed him for a day; teach a man to fish, feed him for life", the ideal would be to install a means to grow the food locally. That comes with all the caveats for building farms: what is sustainable, getting the land, getting the workers, protecting from poachers, etc.
You'd think it would be easy to employ your own army? Why don't they do that already? I think the answers are pretty obvious. Even if one were to consider doing it on foreign soil, with different laws, it would certainly create plenty of legal and cultural problems that throwing money at it would quickly drain the well.
This is really specifically a question: can enough money solve the biggest problems?
I would imagine, if it were treated like a 20-year planned investment, there could be some progress.
(The trouble here is the laziness in looking into the fact of whether or not these programs are already in place, or what ideas have already been out there.)
This is a cartoonish perspective on the problem for clickbait. :P~