近づける is a transitive verb.
- X: 僕は子供を池に近づけない。I keep away the children from the pond.
But there is a case in which 近づける is used without an object as the following sentence quoted from another answer.
- Y: AはBにCに近づいてほしくないと思っている。A wants B to keep away from C.
When there is no explicit object given for 近づける, do we have to assume the object is actually the same as the subject?
It means Y can be rewritten as
- Z: AはBにBをCに近づいてほしくないと思っている。A wants B to keep away B from C.