and thats ok. One time Zelensky was in some cafe and urinated in its toilet. After he left, some opposition party member got in and took the samples of his urine and tested it for drugs, proclaiming that Zelensky had drugs in his urine.
So maybe Putin also afraid that someone will take his biomaterial with nefarious purposes. Maybe they can learn what medical drugs he is using and deduce his health, maybe they can take his dna and then run some tests. Your DNA is very precious and you should cherish it if you are famous. If you are no one and don't have enemies even then you shouldn't leave your cum around