The EU has gradually increased its capabilities in the field of internal security, developing an arsenal of bodies and instruments to address security threats, within the strict boundaries set by the EU Treaties. Figure 52: Consolidating EU internal securityA strong European security ecosystem. The Internal Security Fund (ISF), allocated € 1.93 billion (current prices), is the main instrument aimed at ensuring EU internal security, by tackling terrorism and radicalisation, serious and organised crime and cybercrime. EU action with external partners/international organisationsThe transnational nature of many threats to EU internal security underscores the need for international cooperation. There are currently three intelligence bodies within the EU structure: the EU Intelligence and Situation Centre (EU INTCEN), the EU Military Staff Intelligence Directorate (EUMS INT) – both forming the Single Intelligence Analysis Capacity (SIAC), which combines civilian and military intelligence – and the EU Satellite Centre (SatCen).