Absent putting up some sort of heavily defended Maginot Line from sea to sea, there is no way NATO could defend the Baltic States. All NATO could do would be to launch a bloody war to retake the territory.
That doesn’t mean the Baltic States shouldn’t be in NATO. There are good arguments both ways for that.
But it does mean that perhaps NATO didn’t think things through when the Baltic States were first admitted.
Side note, just for the heck of it: The Maginot Line gets a bad rap these days. But it was pretty darn formidable. So much so that the Germans decided to go around it. Later, the Germans tried to attack the line from the rear. Even that failed.
wasn’t a major issue for the maginot line that belgium refused to actually build their section, and the germans just went through the ardennes?