How can foreign protectionism affect local FDI I am citing an article here: 
In a speech at the G-20 in Istanbul, TİM’s Mehmet Büyükekşi said, “Protectionism is increasing in every market around the world and it is affecting not only Turkish exports, but also Foreign Direct Investment [FDI] in Turkey. 

I really can't see a link between protectionism in another country and FDI in Turkey. What is the link here? Also, he later says that devaluation of euro against the dollar affected total FDI value. That makes a little more sense to me, because it can be that amount in euros prepared for some investment in Turkey suddenly became less valuable. I hope that is correct, but I don't get the protectionism part?
A protectionist policy in other countries could take the form of providing more incentives for companies to invest domestically instead of abroad. For example, U.S. companies face penalties if they invest abroad compared to investing in the U.S. or they have more benefits from investing in the U.S. now compared to before. Anyhow, companies outside of Turkey could have more inventives to invest in their own countries, which in turn means they have less incentives to invest abroad, which in turn means they have less incentives to invest in Turkey, which in turn means they invest less in Turkey.