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The Second Khitomer Accords were an interstellar treaty that banned the use of subspace weapons.
In 2375, the Son'a armed their vessels with isolytic subspace weapons that were banned by these accords. (TNG movie: Star Trek: Insurrection)
In 2381, the USS Titan was carrying tricobalt devices whose use was monitored under these accords. (TTN novel: Synthesis)