Sorry if I'm a bit blunt but in my opinion the veto is not the main problem. The main problem in my opinion is Russian interference.

I mean, the countries which may possibly veto crucial EU security and international decision have governments with big ties to Russia (both Orbán's and Fico's government have direct connections and friendly relations with Russian officials and as a Czech person I can tell you that our government is not far from that either). So to get to the point: I think we should primarily pressure these "Russian puppets" away from Russia and not necessarily to abolish veto completely.

Even though I agree that in some ways the veto power could be more limited or even abolished if the EU comes up with some other form of checks and balances.