It is exercising that power to the extent it can. Taking them to court and applying economic penalties would be how actual federated states deal with rogue prov

It is exercising that power to the extent it can. Taking them to court and applying economic penalties would be how actual federated states deal with rogue provinces, at least, at first. The EU doesn't have a federal police force, or even a military with a mandate to reimpose the rule of (European) law in Poland. So it's silly to suggest it has the powers of a federal state, and hence the culpability of one, so should somehow be considered illiberal.