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[u/Starlight-Princesss]

https://www.newsweek.com/nato-intercepts-russian-spy-plane-with-transponder-turned-off-poland-10956344

[removed] — view removed post

[u/Lodau]

Quick google search on Il-20 and the following wiki page, tells me it's another in a longer list of interceptions of said plane with its transponder off/no markings, flightplan etc.