Neighbor crossed the line

I recently started clearing some shrubbery on my property line. Well my neighbor took it upon himself to chop down THE REST of my shrubs while I was out. I KNOW it was him. There is red stuff on the stumps as well now, not sure what it is. Can't see where to attach pictures.

I'm fuming. My landlord has warned him before not to come onto our property again. I wish I wasn't just a renter. I think my landlord will finally install cameras after this.