One of my players intentionally gave an Ancient Red Dragon a sword that he was bonded to so that he could summon it at some point in the future and therefore draw the ire of a super powerful being to some location, kinda as a last ditch suicide bomb. I fully intend for this to work (it's super clever.) However, I do find it kind of odd that there doesn't seem to be anything anyone can do to stop this — even if the dragon knew about the bond it can't break it. This is even stranger when compared to Drawmij's Instant Summons, which could at least be dispelled, and that's a level 6 spell costing 1000 gp.
So can a weapon bond be broken? If so, how?