Before you can treat this as a behavioral problem, he needs to be checked to make sure he doesn't have a medical problem such as an urinary tract infection. When a cat has a UTI, they will not go in the litter box because they associate this with pain that they're having when they try and urinate. If he gets a clean bill of health, then it could be a territorial thing. Please have a vet check soon. If he would have a blockage it could be fatal.
Trap-Neuter-Return (TNR) is a full management plan in which stray and feral cats already living outdoors in cities, towns, and rural areas are humanely trapped, then evaluated, vaccinated, and sterilized by veterinarians. Kittens and tame cats are adopted into good homes. Healthy adult cats too wild to be adopted are returned to their familiar habitat under the lifelong care of volunteers
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