As part of NATOs collective defense operations.
F-35's Failure to Detect Russian S-300 Frequencies Sparks Major Concerns - Defence Security Asia
Factbox: The F-35 - stealthy, numerous and expensive
The US Air Force sent F-35s to defend NATO. Here's what it learned.
Lockheed Martin F-35 Lightning II - Wikipedia
The US Air Force sent F-35s to defend NATO. Here's what it learned.
U.S. F-35s Have Flown Patrols Over Eastern Europe Without Radar Reflectors - The Aviationist
American edition: F-35 fighters transferred to Europe faced the problem of detecting Russian S-300 air defense systems
atualidades
F-35 vs Su-57: everything is on the verge of fake
American edition: F-35 fighters transferred to Europe faced the problem of detecting Russian S-300
USAF Analysis: China Hopes The US Can't Afford Enough B-21s to Make A Difference : r/LessCredibleDefence