Country X1 is claiming that country X2 is allegedly doing bad thing Z. If it turns out that it is the country X2 that is actually doing Z, you would call it hypocritical, wouldn't you?
Like Russia talking about the importance of international law and sovereignty of Iran. Like Israel speaking how much against Holocaust/genocide they are.
Snd words do mean things and they don't discriminate. So all the "it's only bad when others do it, for us there is an exception" defence is invalid. It is indeed hypocritical.