I am not so sure, But one thing i am sure of, Is the Logistics needed to have even a squadron of our fighters over there is massive and that's using our own highly trained personnel. Now imagine newly trained Ukrainian's it would be the mother of all cock ups. The same with deploying three very different battle tanks. three times the logistical problems.
The Russians appear to me to be holding back and using a softer approach than maybe the world was expecting, Preferring to try to demoralise the people into deposing the current leaders, How long this approach will last i do not know, Bu