A lot were disarmed and sold off on the open market by Germany, these are designed to use Tow, which the Ukrainians have. Small and lightweight they appear to be in service.
Photo, published online recently, suggests a unit of Ukrainian army, most likely the 3rd Assault Brigade, has acquired a Wiesel airborne armored fighting vehicle equipped with a TOW anti-tank missile system.
This vehicle seems to be a de-weaponized variant that can be purchased on the civilian market without limitations, whereas the missile was installed upon delivery. Alternatively, the weapon might be replaced with a turret or a machine gun.
https://en.defence-ua.com/weapon_and...ttes-8846.html