Suppose you have no tech that directly defeats/damages them.
Defended a newly-captured planet with: level 7 (colonizer) and level 4 (support) Vasari caps (3 fighter squadrons total), 5 flak frigates, and about 23 LRFs.
Versus these attackers: level 3 rapture, 8 drone hosts (25 squadrons total?), 5 siege frigates, and 2-3 LFs.
Kept the flak frigates targeted on bombers but they just didn't do a lot. Killed everybody--cap and DHs first, let the planet go--for the loss of 7 LRFs (who cares?) plus my level 7 cap (ouch). One thing I missed was I didn't micro the invulnerability, which could have prolonged my good cap--although it would have cost some disassembly attacks, so it would have increased my other losses.
Did I miss somesthing else?