Starfleet Jedi

Far all cannon evidence go near to impossible Klingon Empire to even try to conquest UFP. Even attempt to destroy UFP leave Klingon Empire weakest possible other invaders that just for starters. Cardassion, Romulas and Breen every one else take want Kligon Empire fleet business try destroy UFP. Of course just for starters race like Metrons saw the Federation as half savage look Klingon Empire much more savage and violence and blood thirst then UFP. So how could Klingon Empire possible be able to conquest the UFP.