Place it at the close of a negotiation scene, right after the handshake beat, then follow with a clapping sound for a mock ceremony or a fail sound meme when the deal instantly falls apart in the next shot.
About this sound
This is a short spoken clip, just under six seconds, built around a single voice delivering the line 'peace of our time' in a formal, declarative tone. It lands solemn at first, then faintly ironic, because the promise sounds grand while feeling fragile, which makes the line hit harder when the situation on screen is clearly anything but settled or safe.