Replying to [silverjeffsilver]:
For little starters:
1. Make yourself so valuable in sales that the Turkish company can't do without you.
2. Insert a contract condition to the effect that, in the event of default on the part of the Turkish company, you are at liberty to immediately obtain and sell competitor's products to your past sales customers (such at least may cause your principal to think twice before failing to pay your commission).
3. Consider a further condition which allows you, at your discretion, to get the USA buyers to sign simple little non-circumvention agreements direct with you. Or, at least talk with your lawyer about how to somehow bind USA customers to your side of the bargain. A USA party would be less likely to default than a foreign party.
There is much legal machinery you can incorporate but, considering the high cost of litigation, a contract is no better than the true intent of the parties.