Tell him to do one.
If it's on your property there's nothing he can do. He can trim back the bits that cross the boundary line but that's about it.
I'd ask to see the problem, but I think it would a decision between you and your neighbour.
Edit - you're supposed to notify your insurers if you have a tree causing damage to a neighbouring property.
If a tree on your land is damaging someone else’s property then you are liable, irrespective if they’ve been told to do one or not.
@andyp started
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Tell him to do one.
If it's on your property there's nothing he can do. He can trim back the bits that cross the boundary line but that's about it.
I'd ask to see the problem, but I think it would a decision between you and your neighbour.
Edit - you're supposed to notify your insurers if you have a tree causing damage to a neighbouring property.