I’d be careful with this example. One of the key issues people take with the UN that they indeed can’t enforce things, like in Gaza. Security council approved a ceasefire, but the fighting goes on. Russia doing genocide in Ukraine, UN tells RU that they need to stop being bad.
For the record they of course do stuff, but if you’d like to advocate for anarchism I’d use a more effective example. If even the UN can’t stand up to fascism, what shot does an anarchy have, ya know?