The recent attacks in Paris once again triggered accusations that Turkey has not done enough to prevent Islamist extremists from various European countries traveling to Syria to join the ranks of the radical militants of the Islamic State of Iraq and al-Sham (ISIS). On every possible occasion, including the NATO summit in Wales and the G20 summit in Australia, Turkish leaders have said that international cooperation and intelligence sharing was vital to combat the influx of foreign fighters into ISIS-held regions in Syria and Iraq.The issue of the Paris terror suspect's widow Boumeddiene was not the first incident. Previously in November, Turkish officials arrested a French national for the second time on suspicion of attempting to join ISIS in Syria. The suspect was arrested in September for the same reason and deported to France.Due to a lack of cooperation or not responding to Turkey's warnings regarding its citizens, France is now accused of not doing enough to combat terrorism, which has become a large domestic issue, on a global level.It seems Western countries were justified in their panic that sooner or later those of their nationals who joined ISIS would eventually return to their countries of origin and perform acts of terrorism. What happened in France shows that these terrorists with links to ISIS and al-Qaida have returned to France after visits to Yemen and Syria before they unleashed their barbaric acts on French citizens irrespective of their color or belief.Turkey, which has suffered so much at the hands of terrorists of all kinds, ranging from PKK militants to al-Qaida as well as the killing of its diplomats abroad by extremist Armenians, is showing the utmost sensitivity to monitor the activities of potential religious extremists, as well as left-wing terrorists. The fact that Turkey receives millions of tourists every month and that it has introduced an electronic visa system where people can obtain entry visas with great ease has, of course, complicated the picture. Turkey cannot afford to harass its visitors in the name of fighting terrorism. Thus it has to approach the issue with sensitivity and we feel the Turkish authorities are doing this with success.What is sad is that the Paris incidents have shown that the Western security authorities seem to be monitoring the movements and actions of potential religious extremists in their own countries and yet they do not properly share such information with Turkey. When Turkey is kept in the loop, it has shown it can monitor the activities of such radicals with great ease and efficiency.It is coming to light that Turkey has denied entry for hundreds of people who were regarded as extremists by European authorities. Turkey has also caught hundreds of such militants trying to make their way to Syria. All of this is because of the sensitivity of the Turkish security apparatus and because Western officials have shared information with us. So it seems better channels of communications are needed.Despite all this Turkish public opinion feels resentment not only because Turkey is being accused of allowing extremists to join ISIS in Syria and Iraq but because many Turks remember well how, for decades, European authorities openly rejected to extradite Turkish terrorists who had committed crimes in Turkey and who had escaped to Europe.The case of the assassinators of businessman Özdemir Sabancı is still fresh in our minds. Fehriye Erdal, who took part in the assassination of Sabancı in Istanbul, was actually given shelter by Belgian authorities and her trial turned into a farce. At the end of the day, Erdal disappeared and is still at large.There are numerous such incidents that make a long list. Turks remember all this with bitterness.Many terrorists who have harmed Turkey are still given shelter in European countries. Many Turks today question if this is how we should cooperate to end the terrorist danger in the world.