Word for someone who always relates a topic of conversation back to their topic

Question

I have a friend who consistently relates any conversation back to their set topics. Such as North Korea, nazis,soviet union, freemasons and greece. For example, I was talking about disney killing off big characters in their franchises they have bought. And he replies
"oh,hes doing a stalin"
And then lists times when stalin has killed some people for some reason or another. Most times it's like 10% related to what we are talking about, but if we go back onto the original conversation, he will find another way to relate back to one of his chosen topics.
It's quite annoying and I want to know what it's called so I can talk to him about stopping it. If we entertain it he wont stop!
Someone suggested "circular conversations"

Anton · Answer

Your question is clear, although limited in its example.
At worst, such a person is a monomaniac

= suffering from or relating to monomania (= a condition in which someone is extremely interested in one thing)
Cambridge

They may be described as monomaniacal
However, the term is for extreme cases and another milder word is to describe the person as fixated

fixated = unable to stop thinking about something
Cambridge

fixated is an adjective and I have been unable to find a corresponding noun to attribute to the person.
You might also consider obsessive. As an adjective or the corresponding noun:

obsessive = thinking about something or someone, or doing something, too much or all the time
Cambridge

Lastly, we have one-track mind

=someone's tendency to think about or be interested in a single subject
Cambridge

This last may be the kindest and least psychological term to describe the behaviour.

Word for someone who always relates a topic of conversation back to their topic

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