Well, I meant this outlet is not impartial, and it is often cited in Russian state media when they write about "strong Russian superweapons":

"It is worth pointing out that it is not the first time the National Interest has been a crutch for Russian propaganda outlets. Indeed, the U.S. publication seems to run a story every week about some Russian superweapon that America must fear. The latest came just four days ago, and claimed a developmental weapons system, the S-500, will kill all U.S. fighter jets.

Almost all of these stories get regurgitated in the Russian press, and presented to the Russian people as conclusive evidence that Russia is the great military power the Kremlin claims to be."

https://www.themoscowtimes.com/2017/04/14/dear-america-russi... (2017)

This article on the other hand is about American "ultimate Cold War terror weapon", so probably could contain bias in the other direction (I just skimmed it).