a) no-one wants that, so b) no-one would vote for that, and so c) it won't happen. In some remarkable circumstance that the EC proposed such a thing, and all t

a) no-one wants that, so b) no-one would vote for that, and so c) it won't happen. In some remarkable circumstance that the EC proposed such a thing, and all the MEPs did think that was a good idea, there'd still have to be an EU treaty that allowed for it, because it's certainly beyond the scope of the CFSP. Said treaty would have to be ratified by the member states.