Defensive Warfare and Just Cause

وَقَـٰتِلُوهُمْ حَتَّىٰ لَا تَكُونَ فِتْنَةٌ وَيَكُونَ ٱلدِّينُ لِلَّهِ ۖ فَإِنِ ٱنتَهَوْا۟ فَلَا عُدْوَٰنَ إِلَّا عَلَى ٱلظَّـٰلِمِينَ

Fight them until there is no [more] fitnah and [until] religion [i.e., worship] is [acknowledged to be] for Allāh. But if they cease, then there is to be no aggression [i.e., assault] except against the oppressors.