Eh but Wagner is not the Russian army, right? They are an "independent contractor" after all. And Russian speaking minorities may "suddenly" decide to rebel. And NATO may be not so eager to activate article 5 since they are not suicidal too.

Long story short I am not sure NATO Eastern Europe is protected 100%. Luckily for now Putin cannot afford another front but there is already some saber rattling between Belarus and Poland and Wagner is in Belarus.