How do I get rid of neighbor's shrubs that come through his fence?

I am 75 and cannot stand back there and clip and dispose of all the growth that comes through his 8 ft. high fence. I assume that if I Round-up what is on my side, it will kill his whole plant, so that is not an option. Most of his plantings have thorns and I can't avoid them on my riding mower. I don't want to be the Ugly Neighbor, so what options do I have?
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