- The EU meddles too much in internal affairs.
- The EU should intervene in here, and it's awful that they don't.
As Ich says, the EU has always been about creating the environment for peace or at least the incentives for peace. It has not yet developed true "peacekeeping" institutions like NATO or the UN. It may be that crises such as this one at a time when the US is seeming more isolationist force the Union to consider inventing them.
On all this tiresome and rather juvenile sneering about the EU's peace mission: The EU was founded by - and mainly constitutes - countries that have centuries of experience seeing the ugliest side of war again and again and again. The choice was very simple: stay stuck in the cycle of "every power for itself" which destroyed the continent many times over, or make a serious effort towards mutual dependence, co-operation and peace. Europe can try for that, and gradually learn from its mistakes to improve that mission, or it can give up because it is too hard and go back to the bad old days. I personally know which one I would choose.