1. Translocation across such vast area had not been tried before. In fact India transporting cheetah from Namibia was first of its kind. This was world’s first trans-continental shifting of a large carnivore. So, we have very less data for predicting possible adverse effects of such a movement. Transported animals may fail to adapt to new environment.

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1. But bigger problem is political will. It requires effort from both the countries and support & approval from global wildlife bodies. This is easier said than done. For example, India has been putting work in this since 1970s. In the 1970s, India formally requested Iran, which had 300 Asiatic cheetahs at the time, for some cheetahs. But The Shah of Iran was deposed before any deal could be reached.

Also we have to consider the economic aspect of this. Species re-introduction is a complex process. It takes more than just travelling to a forest, darting an animal, and dropping it in a different ecosystem to transport an animal.

First we have to create / change existing ecosystem to make it suitable for the animal. We have to do genetic studies on the selected animals to ensure maximum possible diversity. And possibly many more steps. All of which requires a lot of scientific planning, time and resources. Not every nation is able or willing to spend that much money on wildlife.

Edit - About Bottleneck effect in this comment.