It'll be raining cash in the Ukraine.
Yet to be seen.
First, EU Europe is 27 countries
Now this initiative is called "Coalition of the willing", a term of day politics.
UK - Germany - France -Poland - Italy. (where are the rest of 27?)
Mind, day politics is one, strategy is something to form and develop for next 20-30 or 50 years.
Then, next, Europe is disarmed. Defense budgets neglected for decades.
I suppose, individual member states will first start investing in their own defense capabilities.
Germany is facing recession. No cheap energy. (And Germany is the engine of Euro economy)
other inland countries feel energy prices, too.
How to build up armies in one month? Who will pay? If money is available, where is industrial surge capacity?
As I gave example earlier, Croatia gave up ALL of the last operational tanks to Ukraine. My educated guess, we have to purchase new ones asap. And keep them for us.
(and who in Europe can produce tanks at all? few countries, only. Soon they will be booked with orders)
Will member states send them again to Ukraine? (my guess, good as yours)
I suspect many countries face the similar problem.
Second, EU is not the state.
EU is union of individual sovereign nations, and member states will in time start raising their (possibly different) voice. Today it is Hungary and Slovakia, Romania sends strange signals following annulled presidential elections, soon we will see...
I will try to explain like this:
When there is a discussion in America, about banning the guns and gun control, peoples call for 2nd amendment.
When there is an issue on religion, free speech or press, peoples call for 1st amendment.
Basically, peoples call for basic bill of rights, as it was conceived once when founding fathers founded the united states. Those are the routes.
Europe, is economic union of sovereign states.
European countries signed up for economic prosperity and so the nations joined and united. Those are the routes.
European nations did not sign up for new "Barbarossa". And moving in that direction will cause tectonic political movements in member states.
As there is no actual cash available, some voices call for frozen Russian assets to be used to finance all this.
I guess this is doable.
But think in long term the consequence in the trust to European banking? Who will do business with them in the future, globally? Lest say, a country from South America, Asia, Africa - will they do business with Eu banks, or within the Brics?
In business trust is everything.
So everything is on the table, and nothing looks certain.