Why I say he wants the EU to join him is because he sees the Muslims already living in EU countries as a sort of advance column, building mosques, setting up Sharia courts and he has said every Muslim woman's womb should bear as many Muslim babies as it can in order to out-breed the indigenous population & avoid integration as much as possible - & folks, they're doing a pretty damn good job of it.
The UK is, or was (let's use the past tense) one of 3 net contributors, meaning all the other members had their hands held out to revel in our munificence.
What are they going to do now? I have no idea, although if the Eurovision Song Contest is anything to go by, the EU will soon be welcoming Israel as a European country. And Australia.