The EU is perfectly capable of collaborating even when it can't reach full consensus or when it wants to include peripheral states without them becoming full members. See for example the Schengen area, Eurozone, European Economic Area, and more recently (and specifically to circumvent member state vetos) when the enhanced cooperation procedures were invoked to lend money to Ukraine.

Exactly, see what is happening in Hungary.

Controlling Hungary is enough to veto some support for Ukraine.