(RARE) Bulgarian Song about Russian-Bulgarian friendship "България-Русия"

Here's the one of forgotten song from communist Bulgaria, singing about their friendship between Russia and Bulgaria. Russian version can be found on UA-cam while this Bulgarian version, with different melody cannot, so I decided to upload it.
Remastered by me, Mrexctbhj.
Credit me if you use this audio.

[@funnyjet1105]

Can you add the lyrics aswell please?
Even though I am Bulgarian I cant understand it well.
Thanks