The use of depleted uranium munitions has been fiercely debated, with opponents like the International Coalition to Ban Uranium Weapons saying there are dangerous health risks from ingesting or inhaling depleted uranium dust, including cancers and birth defects.
Russia started the war in the first place because — whether you think the fear is reasonable or not — Russia has loudly proclaimed for decades that they view NATO encirclement as an existential threat, and Ukraine joining NATO would massively expand NATO presence on the Russian border, leaving basically only Belarus as a buffer. And if Ukraine took Crimea with them while joining NATO, Russia would lose access to their only deep warm-water port on the black sea, Sevastapol, a port that is economically significant to them.
Maybe if Russia stopped invading their neighbors, then other neighbors wouldn’t feel the need to join NATO as protection from Russia.