Hi mssale and welcome to SaleHoo, nice to see another member from Turkey on the boards.
To cover your question. It wouldn't make sense to have a product imported to you in Turkey, only to then on-sell to another country, that's just doubling your shipping time and expense.
Of course if you are going to be selling into the local market, than that's a definite option. A side issue to that is, if you are Drop Shipping, it's always a really good idea to order in the product for yourself first.
That gives you a chance to check the quality ad even take your own photos so it makes it much harder for buyers to identify it as a drop shipped product.
With Drop Shipping from China to the US the two main issues to watch out for would be shipping time, shipping price and item location. For example, a buyer in the US might be put off from buying a product listed as being in China because of shipping times.
Selling from a US supplier into the US market is probably the best option as it ticks all the boxes. Your shipping time should be good, of course that will come down to the supplier in the end. Shipping costs should be in the right ball park, and you have the big advantage of the item location being listed as in the US.