1. Creare own faction and create a home base as close to NPC faction center as possible
2. Outfit base with long range, self-guided, long recharge missile turrets
3. Cause war with NPC faction
4. Soon NPC faction will arrive and start spamming "Attacks will not be tolerated" UI-only message.
Note: unclear if you need to be a personal enemy, or whole your faction, messages are adressed to faction.