That’s not clear, we need lots of answers including to those questions above.
But there’s already been work done to get round the political problems.
A year ago, most EU members signed up to a legally binding deal to deepen defence co-operation and provide a plan for national contributions.
The Permanent Structured Cooperation (PESCO) is part of the EU's defence policy where 25 of the member militaries pursue integration.
PESCO already has 17 projects including some common training and exercises, development of operational domains and capabilities.
Five EU members, including the UK and Ireland, opted out of PESCO.
Why do France and Germany want a European Army when there’s already NATO?
NATO is dominated by the US, which holds the most political power and firepower because it spends most on defence.
It looks like the Trump-era has got them thinking that Europe might be heading in a different direction to America and needs to build a multinational capability outside of NATO.
French President Emmanuel Macron said Europe was the loser in President Trump’s decision to pull out of a missile treaty with Russia, and went on stating: "We need a Europe which defends itself better alone without just depending on the United States, in a more sovereign manner."
German Chancellor Angela Merkel said it is "not an army against NATO, but it can be a good addition for NATO".
The impending departure of the UK from the table in Brussels could make it easier for the EU to agree to the creation of a European Army.
Brexit might also have focussed minds in Brussels, without the UK the vast majority of NATO’s defence spending will come from outside the EU and that could reduce the bloc’s influence in any NATO talks.
Will a European Army actually happen?
I’ll point you back to the first answer – a lot of details need to not only be decided but also agreed for this to happen.
It is though clearly on the agenda, and with the EU’s two biggest powers behind the push, it will probably get some serious consideration and effort.