[Blue Jays]

"...razor wire..."

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The additional advantage of razor wire is that it can remain in place even after the adjacent primary border wall is completed.
The reality is that 95% of people do not even wish to walk too close to a rose bush with sharp thorns.
A thick string of razor wire in front of a formidable high wall will likely discourage 99.99% of people who even look at it from afar.

[Ban Draoi Marbh Draoi]

I remember a picture that I saw of a rose bush that had canes as big around as my thumb and thorns that were about an inch long.

My husband and I thought about getting several of them to plant in front of our windows.