A scheme uncovered in 2259 on the mining world Cajitar IV, where a syndicate of Klingon and Federation war profiteers built a false Starfleet ship to provoke a new war.
Cajitar IV was a dilithium mining planet on the Klingon border, worked in alternating shifts by both powers under the peace treaty. A group called the Broken Circle, made up of people from both sides who had profited from the war, wanted the fighting to resume.
In the Strange New Worlds episode The Broken Circle, La'an Noonien-Singh sends a distress call from the planet. With Pike away, Spock takes the Enterprise out of spacedock without permission. M'Benga and Chapel are captured and taken aboard a mock Federation vessel that is to attack a Klingon ship.
The two fight their way out with the help of a combat stimulant and warn the Enterprise, which destroys the false ship. Spock then smooths matters over a barrel of bloodwine with a Klingon captain.