...against whom?
Well... that's clearly the problem for a lot of the EU countries.
Yesterday, the EU was forced to effect a name change to its "ReArm Europe" plan. Under Spanish and Italian pressure it was changed to "Readiness 2030", because they thought the previous name was too militant.
Georgia Meloni's issues are clear. She has a coalition partner - Liga - which is super pro-Russian, and on which she relies to stay in power. The hard right Matteo Salvini is a staunch opponent of any aid to Ukraine or Supra-European defense structures.
Spain is more interesting. It's not a rightist government, but a leftist one under Socialist Pedro Sanchez. He made some waves two weeks ago when he said that Spain was not worried about Russian troops invading through the Pyrenees Mountains.
Then yesterday he said that it would take Spain approximately until 2030 to reach the target of 2% military spending (currently 1.19% - lowest in Europe). Further, he said he wants spending on cybersecurity and combating climate change to count towards the 2%.
At least the Spanish and the Italians don't understand what they are supposed to be defended from. Also, because Italy has never truly benefited from the NATO alliance (instead it was an aggressor twice against its core founding members), while in the case of Spain the West did everything possible to show them that they do not view Spain as an ally.
Further - in Spain there are strong regional voices, that have a fearful view of the central government in Madrid growing too powerful and too nationalistic. The same is actually true of Italy, where Southern Italians view Italian Nationalism and Italian Militarism negatively.

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