How should a country react against terrorism?

How to fight terrorism: EU action 

Increased exchange of information in the fight against crime and terrorism

Criminals and terrorists often use false identities to evade border and law enforcement agencies. That is why the exchange of information between the various authorities in the EU countries, i.e. between law enforcement, judiciary and intelligence services, is particularly important.

In 2018, new rules were introduced to strengthen the Schengen information system (SIS), which introduced new alerts related to terrorist activities. The database enables police and border guards to enter and consult reports of wanted or missing persons and lost or stolen items.

In order to be able to use existing and future databases in a more intelligent and targeted manner, the EU information systems for border protection, security and migration should enable the exchange of data. The systems should be compatible from 2023 and offer a single search interface and a biometric comparison function.

The EU law enforcement agency, Europol, supports the exchange of information between national police authorities. In May 2016, the EU Parliament voted to give Europol more powers to step up the fight against terrorism, as well as to set up special forces like that European Counter Terrorism Center (ECTC), which opened on January 25, 2016.