Why the US isn't scared of Russia's S-400

Russia’s S-400 Triumf, often referred to as the SA-21 Growler within NATO circles, is widely touted as one of — if not the — most capable air defense systems in the world.

With the ability to leverage a variety of missiles to engage different air threats, an engagement range of nearly 250 miles, and widely praised counter-stealth capabilities, the S-400 has gained a reputation as one of the few systems capable of countering America’s air-dominance approach to warfare.

But is that actually true?

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Further Reading
Full S-400 Analysis: https://www.sandboxx.us/blog/the-s-400-myth-why-russias-air-defense-prowess-is-exaggerated/
How Russia’s warfare doctrine is failing in Ukraine: https://www.sandboxx.us/blog/how-russias-warfare-doctrine-is-failing-in-ukraine/
Hypersonic missiles and missile defense: https://www.sandboxx.us/blog/hypersonic-hype-overestimates-modern-missile-defense-capabilities/
Tracking stealth on radar: https://www.sandboxx.us/blog/americas-enemies-can-track-stealth-fighters-on-radar-and-it-isnt-a-problem/
AARGM-ER: https://www.sandboxx.us/blog/the-navys-new-missile-could-make-non-stealth-fighters-viable-again/
Rapid Dragon: https://www.sandboxx.us/blog/rapid-dragon-turning-americas-cargo-planes-in-missile-packed-arsenal-ships/

Citations:
Missile Defense: https://www.rand.org/natsec_area/products/missiledefense.html
S-400 development: https://missilethreat.csis.org/defsys/s-400-triumf/
S-400 EW countermeasures: https://www.jstor.org/stable/pdf/resrep11662.pdf?refreqid=excelsior%3A33675ceb69b39f05ae9f98abbf3e38e3&ab_segments=&origin=&acceptTC=1
RCS figures: http://faculty.nps.edu/jenn/ec4630/rcsredux.pdf
S-400 Hellenic Air Force assessment: https://www.researchgate.net/publication/259503614_Low_Observable_Principles_Stealth_Aircraft_and_Anti-Stealth_Technologies
20 miles targeting envelope: https://aviationweek.com/defense-space/sensors-electronic-warfare/measuring-stealth-technologys-performance
Russian military doctrine: https://sgp.fas.org/crs/row/IF11625.pdf
S-400 cruise missile vulnerability: https://www.rand.org/blog/2020/05/russian-s-400-surface-to-air-missile-system-is-it-worth.html
Geographical features as a limitation: https://worldview.stratfor.com/article/why-s-400-s400-missile-long-range-turkey-russia-syria-effective
Russian S-400 tests: https://www.nti.org/analysis/articles/global-missile-defense-race-strong-test-records-and-poor-operational-performance/
S-400 in Syria: https://www.rferl.org/a/weher-was-the-s-300-s-400-missile-defense-systems/28417014.html
Pakistani Air Forse S-400 assessment: https://www.airuniversity.af.edu/JIPA/Display/Article/2743750/indias-acquisition-of-the-s-400-air-defense-system-implications-and-options-for/