I was talking to someone one about something similar in Africa, they were saying that really its better for western countries if the majority of Africa stays as third-world because that way the west can exploit its natural resources much easier and cheaper. I'm not sure countries deliberately keep Africa as third world but he is right.
Much the same thing with the middle east, keep it in turmoil and the oil is much cheaper, look at how much settled states like the U.A.E. can rake in for their oil.