A European Council summit dedicated to defense and Ukraine is slated for Thursday; EU leaders are expected to discuss ways to fund increased military expenditures.
Macron also hinted that he would propose a new defense budget for France, despite lacking a parliamentary majority to pass it.
While I agree that full integration under the EU-27 is impossible in practice, I do believe that something like monetary union would be possible. A two-speed union where those who are prepared are quickly integrated and those who do not want to are left out, still covered by the article 42 of the Lisbon Treaty, but without common forces based on its territory, that could make the difference between repelling an invasion or being released later, so there would still be strong incentives to want to enter.
I am aware that it is also politically complex, but I do not see it as impossible with the current climate.