Larger stealth aircraft such as the Northrop Grumman B-2 Spirit or forthcoming B-21 don’t have many of the airframe features that cause a resonance effect—and are, as such, much more effective against low-frequency radars.
The problem for Moscow is that while Russian early warning and acquisitions radars operating in the VHF, UHF, L and S bands can detect and even track a tactical fighter-sized stealth aircraft, those systems don’t deliver a weapons quality track.
Kofman notes that advanced Russian-built air defenses like the S-300, S-400 and forthcoming S-500 family come with systems designed to detect and track the presence of low observable (LO) aircraft such as the F-22 and F-35.
“In terms of establishing viable air defenses against opponents with fifth generation aircraft, it's quite clear how Russia is trying to tackle the problem of stealth," said Mike Kofman, during an interview with The National Interest.
Russian air defenses will still struggle to effectively engage fifth-generation stealth aircraft such as .
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