I’m not sure Ukraine is capable of changing tactics. They are stuck in a gambler’s fallacy where they have to continue to double down. Air defenses are not really relevant to the front line. Ukraine’s air defenses have been very poor for a very long time, interception rates for Russian missiles are very low and even drones are increasingly making it deep into Ukraine in large numbers, and Russian airpower is constantly bombing the front lines. But they can’t afford to adopt a more mobile defense because that would be seen as losing. So they have to dig in and stubbornly fight to the last for every position by flooding in untrained manpower and relying almost entirely on drones. Obviously this has not worked to stop Russia, only slow them down, and has led to very high casualties for Ukraine, but there is nothing else that they can politically afford to do. Everything i’m seeing points to them doubling down on this.