They appear to have said [1] they'll supply (finance + deliver) aircraft (which presumably the Ukrainians have the expertise to operate, per [2]). They have not said they'll send in an air force (operated by non-Ukrainians), which as you point out, they don't yet have.
[1] https://www.reuters.com/world/europe/eu-close-airspace-russi...
[2] https://www.barrons.com/news/eu-countries-to-send-fighter-je...