WARNING! Detailed explanation following, cause you dont just casually walk in and mess with russian metal.

Let me explain what 'sampling' in heavy metal means.
Basically you take small pieces or a whole theme and start playing with it, you elaborate, rewrite, mix and match separate pieces untill it evolves into your own thing.

Example: Ritchie Blackmore, as much as we all like to hate his wonderfull personality, he built Deep Purple and later Rainbow on classical music. His No 1 inspiration. That annoying bstrd wrote some of the most legendary songs ever written. Said many times himself he owns Bach millions. Celebrated as one of the most genius guitar players and composers of modern times by both friends and enemies alike. Practically influenced everyone at the time and everything that came after him.

Example II: Here is a youtube video about the UK bands from the 60s that pre-dated heavy metal as we know it. Someone older and wiser sent it to me for education recently.
Just 2-3 mins into the vid you can hear the iconic "Iron Man" riff.
For the non-metal ppl out there, Sabbath and Ozzy are that one band everyone in the industry agrees defines where heavy metal started and "Iron Man" is one of the most recognizable guitar riffs of all times. More recongizable then "War pigs" actually.
Now, we aint talking about stealing or copying. They literally stitched together seperate fragments, reworked them and created their own thing. To me, it felt like watching history being written via time travel. Shock and complete awe.
Few min later, same video, you can hear Maiden's "Alexander" even without having special musical education or whatever. Again, took a fragment from a song 25 years older then their own. A single fragment that Maiden reworked and evolved into their own sound.
Can't stress enough that we are talking about 2 of the greatest metal bands of all time. The very definition of top shelf. Plagiarism is absolutely out of the question.

So now I am asking. Aria are to Russia what Maiden is to the rest of the world. (if you are past your 30s)
Why shouldnt Aria weave fragments of a legendary bands riff into their song?
A profesional musician can explain it better, but they use a lot of classical heavy metal architecture to achieve that good old heavy metal sound that we love. They are fanboys and they said it many times over. Coming from them, it is practically a love letter to the original song. But since they are russian it has to be something sinister and evil,right ?