It's not leaked, it's intentionally published on an official substack.
The memo itself is just more lies from christian nationalists. This one is from a catholic who has previously called for ending democracy and having the church take over the state, pretending that he loves the democratic freedoms of places like Hungary and wants to protect them from the evil fascism of anyone left of Hitler.
Here's the article without the link to reddit: https://www.euronews.com/2025/07/10/armenia-and-azerbaijan-move-closer-to-peace-pushing-russia-out-from-the-south-caucasus
It feels a little overblown to me. My understanding is that Russia spurned Armenia and gave their blessing to Azerbaijan's defeat of Armenia. So it's not too surprising that Armenia didn't want Russia to broker the peace, and Azerbaijan didn't need them - they won.
There are troubles in Russo-Armenian relations, but there's no details of Azerbaijan distancing themselves from Russia. If anyone knows more, please let me know.