There are so many regional actors providing financial support to DAESH and the PKK, making it almost impossible for Turkey to stop their terrorism
The fight against terrorism is complicated. In Turkey, it is more complicated as the country is conducting two simultaneous fights against two different terrorist organizations.
These two organizations, namely the PKK and DAESH, have divergent strategies and aims. However, they both target Turkey and have foreign sponsors. Terrorist organizations are by definition illegal; they cannot receive the financial and material help which they need through legal means. Every terrorist organization needs fighters, thus they develop rhetoric attractive to a number of young people. These youth may believe that it is worth dying for their cause, or think that their participation in the organization is an act of freedom. They may also have a number of other reasons to join a terrorist organization. On the other hand, some terrorist groups may force people to join them, or employ physical threats and psychological pressure to make them stay.
That is why the efforts in order to reduce participation in terrorist organizations must be as diverse as the reasons for participation. Officials must never forget that some terrorists have joined in the organization willingly, but there are others who have just been forced into it.
Terrorism is based mainly on human power, but it is definitely not a cheap activity. All terrorist organizations try to acquire money to allow their militants to have satisfactory living conditions, to plan their actions, to buy weapons and other materials, to cover transportation fees and so on. In other words, terrorist organizations need financial resources to survive. It is not enough for a terrorist organization to have dedicated militants ready to blow themselves up, because every action costs money. They have to think about ways to push their militants to commit suicide attacks, but meanwhile they have to find resources.
For these reasons, while fighting against terrorism, one has to determine where the money is coming from, and try to stop that flow. However, as I've said earlier, terrorist groups are illegal so their money resources are illegal as well. In Turkey's case, there are two different terrorist organizations, so one may easily imagine how complicated this monitoring process can get. If terrorist groups had legal financing, following them would be much easier, but this is not the case. As the money flow is illegal, it is quite difficult to track and stop. One can develop a number of tools to legally and legitimately stop that money flow, but this is easier said than done. These organizations have very complicated illegal economic relations. In this context, everything about the international illegal trade must be thoroughly examined, for example drug trafficking, historical artifact trafficking or human trafficking.
The main problem is that the dealers and the buyers of these trafficked items are not always illegal players. A state or a big company may sometimes purchase the services and materials provided - directly or indirectly - by terrorist organizations. One wonders why nobody has been able to finish the PKK or DAESH until now, despite all efforts. This may be because there are so many players who benefit financially from the activities of these organizations.
If this logic is correct, then we must look for those responsible among the rich foreign players. But there is a particularity in Turkey's case: there are two different organizations who are attacking the same country. So their foreign sponsors are probably different - and even rivals.