Russia on Sunday handed Ukraine another 1,200 bodies of Ukrainian soldiers killed in the war, Russian state news agencies reported on Sunday, saying Moscow had not received a single Russian corpse in return.

Military leaders and analysts alike are questioning whether any level of battlefield attrition can alter Russia’s efforts to occupy still more of Ukraine. Former Commander-in-Chief of the Armed Forces of Ukraine Valerii Zaluzhnyi admitted in November,

The attack used almost 500 drones and missiles, breaking a record set just days earlier, as Russia tries to overwhelm Ukraine’s air defenses, which shot down most of the weapons.