Ukraine demonstrated its military capabilities by striking deep into Russian-held territory, successfully targeting Russia’s advanced defensive S-400 missile defense system and conducting special operations raids. The actions showcase Ukraine’s growing proficiency in using home-grown or repurposed weapons to engage with Russian assets.
  

Key Points: 

1. On August 23, Ukraine used a missile of its own design, the Neptune, to destroy a Russian S-400 “Triumf” air and missile defense system stationed in Crimea.
2. Following the S-400’s destruction, Ukrainian special operations forces carried out a raid on the Crimean west coast, engaging Russian troops without suffering any losses.
3. The S-400, one of Russia’s priciest air defense systems, was effectively undetected by associated protective radars, highlighting potential vulnerabilities in Russia’s air defense.
4. The Ukrainian-made Neptune missile was initially designed as an anti-ship weapon, but modifications enabled it to be used as a land-attack weapon.
5. Despite Ukraine’s advancements, Russia faces challenges in its air defense, evident from its stretched resources and an inability to detect and counter Ukrainian strikes effectively.

Source: https://breakingdefense.com/2023/09/what-an-s-400-kill-and-a-spec-ops-raid-reveal-about-ukraines-ability-to-hit-russia/