At that time, Turkey was a Persian empire with strong economic strength. It is already a country with a relatively high population density. At that time, Ukraine was sparsely populated and the transportation was inconvenient. The Silk Road is a trade route, and you can only go to crowded places. For example, the caravan on the Silk Road had 100 horses, of which 10 horses carried goods and the rest carried goods. Go to Persia to sell some horses with supplies and some horse goods. When you go to a crowded place, you don't have to worry about supplies. You can bring less supplies. So you can sell it all the way. After crossing the channel, you will arrive in Greece, which is also a crowded place, and you will sell some of it to Italy. If you take this route, first of all, the roads are sparsely populated, and it is difficult to supply, which is not cost-effective. Second, these places are underdeveloped, silk can't be sold, and good goods can't be collected. The general caravan is like this. Their goods and horses will be sold on the road, and then they will buy horse goods on the way back. After all, it is a few trips to Wan Li Road, and it is impossible without an overall plan. The basic routes are Afghanistan, Pakistan, Iran, Iraq (Baghdad, Basra), Syria (Damascus), Turkey, Greece, Italy and France.