Islamic terrorists strike again in Europe. But it is a few countries in western Europe that have highest risk, not eastern Europe. Why? Politically incorrect as this sounds, the problems happen where the muslims are.

From http://blogs.spectator.co.uk/2016/03/europe-islamism-and-some-uncomfortable-home-truths/

Central Europe, chiefly Poland, Hungary and the Czech Republic, remain largely safe from the terror threat, despite the former in particular being a Nato player in the Middle East. It is precisely because the reasons for this are so obvious that they cannot be mentioned. Poland is 0.1 percent Muslim, most of whom are from a long-settled Tartar community, Britain is 5 percent, France 9 percent and Brussels 25 percent, and those numbers are growing.