Try not using the launcher, it is trash, whichever paradox game, its trash, both Stellaris and CK3 won't start for me if I try using the launcher (not sure when this started, it wasn't always that way, ck3 it worked until the first or 2nd patch, stellaris, a couple years?)
Anyways, if you have Stellaris (or any paradox game I know of) you should be able to start up the game without a launcher by going to the directory where it is installed and using the .exe file for the game, or a shortcut on desktop if you already have one set up, paradox games don't have DRM, so while you may need a game store to install (if you use gog or steam) but they don't even have to be running, let alone started through them to run
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and on possible sanctions note, Im in Canada so no sanctions on mine, its just a trash launcher you are dealing with, if the game is already installed, then even if you could no longer buy or update it, you should be able to run it with or without whatever store you bought it from