> If the west sent more advanced air defenses earlier like people wanted, then the recent damage might not have even happened.

Honestly, it takes time to train people to use advanced systems properly... you can throw gear in to the field all day long, but it wont mean a damn thing if the people needing them are not trained on using them right. Such an act would not only be wasteful, but strategically unwise.(see Russia for examples on consequences of sending improperly trained, and at times poorly equipped/supplied soldiers in to theater.)

Being said, depending on the scope, and complexity of training it can take weeks to months, and what you perceive as dillydallying may very well be more about the delay caused by such than a lack of willingness to send stuff in outright.