The humanoid inhabitants of Kiley 279, a divided pre-warp society that built a warp-powered weapon after observing distant starship activity, prompting an irregular first contact by Captain Pike.
The Kiley are the people of Kiley 279, outwardly much like humans and at a level comparable to twenty-first-century Earth. Their world is split between a government and a rebellious faction on the verge of war.
They appear in Strange New Worlds, the first episode of the series of that name. Starfleet detects a warp signature and sends the USS Archer under Una Chin-Riley to make first contact, and she is taken prisoner. Pike, Spock and La'An, altered to pass as locals, discover that the Kiley have no warp drive at all. Their telescopes saw the fleet gathered near Xahea, and they copied the technology as a bomb.
Pike drops the pretence, brings the Enterprise into view and shows the leaders the record of Earth's own Third World War. The factions agree to talk.