Sorry, but declining a guest is not a good start. Read the latest topics why.
Try to start a conversation with him first. There are many questions hosts can ask, allowing a guest to stay in their homes. Hey, you know how to deal with people in Ukraine, so you can do that!
You can update your additional requirement for making a reservation. It could be previous reviews and Government ID for guests. In your house rules raise all your concerns. You can write something like this: you will be staying in my home and I expect you to provide me with an introduction of yourself first.
And you are a professional photographer, that has only 5 pictures.... How the toilet seat looks like, by the way? 😂