There are two sides for the coin. Unstable and corrupt environment gave a birth to many Turkish businessmen trying to earn money by feeding "crocodiles", getting rich and not doing what they suppose to do by the contract in Turkmenistan. That is why the most of Turkish businessmen (swindler, is better word) got "bankrupt" in the country.
At the same time there are thousands of unpaid local workers and local service companies who were not and will not be paid by Turkish companies, even those who received the advance and even final payments.
Every good business in such situation will try to negotiate a deal with advance investment of course. If the company is stupid or greedy enough to do advance investment in such environment without securing the payment for investments, it is their problem. Business is business.
What is the certain now is the requirement to provide the internationally accepted bank's comfirmation that the company proposing the project (signing the contract) has secured at leadt 50% of the amount of the contract. To keep away swindlers away. What is wrong with that?