Dave Majumdar, National Interest: Russia's S-300, S-400 and S-500 vs. America's F-35 and F-22: Who Wins?
For the Russians, solving the problem of targeting a low observable aircraft is something that they continue to work on—but it is doubtful the Moscow has resolved the issue. Russia's strong investment in layers of air defenses tells us that the Kremlin believes the primary threat to its ground forces comes from U.S. airpower. As such, defeating stealth technology is one of Moscow’s top priorities, Kofman notes, and the Kremlin has dedicated a lot of resources to that end.
Russia has tried a number of different techniques to defeat stealth technology. Among those is trying to develop a tight integrated air defense network with multiple radars trying to look at the same aircraft from different directions—but how effective those efforts have been is an open question. “It's great being able to see an aircraft, or parts of it, but getting accuracy such that you can confidently get a missile near the target is the primary challenge,” Kofman said.
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WNU Editor: On a different (but similar) topic, here are some more links on why Russia's air defenses in Syria did not shoot down the cruise missiles that the U.S. used in striking Syria's Al-Shayrat airbase on Thursday:
Putin Could Have Tried to Shoot Down Trump's Missiles. Why Didn't He? (Popular Mechanics)
Why didn't Putin's Growlers intercept Trump's Tomahawks? Russian leader's missile protection system failed to prevent attack on Syrian airfield (Daily Mail)
After U.S. Strikes Syrian Air Base, Russians Ask: 'Where Were Our Vaunted Air Defense Systems?' (RFE)
Silence of Russian S-300 and S-400 systems in Syria prevented nuclear war (Pravda)
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