Leaflet bombing is actually a powerful psychological weapon
Nobody has ever tried dropping empty weapons along with precious resources though, let alone followed it up with a recklessly hopeful protest march. Symbols are powerful. It wasn't impossible to change their ideology. The Nazi's killed millions in death camps - but over several years, and they were convinced the people that they were killing were sub-human.
Framing is everything. The common German soldier would at least respect the courage of foreign soldiers, maybe only on an unconscious level but there would still be a trace of fellow feeling. That could be emphasised and amplified. Drop leaflets that said something like: "We've completely disarmed our military, we've given you all our weapons. We're coming over the border now, to put your leaders on trial for their crimes. You may kill all of us, we are defenseless. We would rather die than wage war, or let your leaders commit more crimes. Would you rather kill millions of unarmed protesters than see a few men have a fair trial?"
Such desperate diplomacy might have broken the spell that had fallen over the German people. The protesters could even march naked, just to emphasise their humanity and vulnerability. I'm not a troll and resent the suggestion. Might be delusional though.
I mean, the US and Britain were allied with
Stalin of all people. We traded and cooperated with a regime arguably more monstrous than the one we were fighting. There has to have been a better way
With any influence I would, if any crazy fools would agree with me. I would start by promising Kim Jong-un and all his cronies wealth, power and influence - a casino in Vegas or some other unobjectionable position, if they just gave up control of North Korea. When they refused, I would tell them that me and my protesters were coming over to put them on trial. They would not get the death sentence, just a plain life in some secure facility. Then I would threaten them with absolute annihilation if they dared to harm a single protester. This message would be spread to all the people of North Korea via leaflet bombing - alongside a barrage of medicine, food, anti-war propaganda and so on. My bet is a coward like Kim would take the cushy life in Vegas, he would have to be completely insane to think he could fight against the US or some alliance of first world powers