deplete the supplies and munitions that the Ukrainians have in order to make an offensive
Dude this started out with Ukrainians making molotovs. Now they are getting shipments of Bradleys and multiple types of tanks. The west is capable of sustaining Ukraines ammo needs for a while. The US has already went from producing 14k shells a month to 24 with the goal of 85k a month by 2028. That’s just the US, now factor in all the European countries doing the same.
You need to stop listening to whatever sources you are reading.