TLDR: country without any army/terrain is doing evil stuff with diplomacy, I want them dead or at least to leave me alone.

As unaligned Iran, I started war of conquest against Turkey. Few hundred thousand deaths in war Kingdom of Romania joined the effort... what Romania? They got devoured by red menace early on, few years later Iran, German and Japan forces had big party at Ural ski resorts, conquered twice, no sign of Romania is left, or so I thought. Decisive armored push ends the war, Turkey surrenders. Can't put Romania to grave because they have nothing to give up. Apparently 13 cargo ships and bunch of derelict fighter planes is enough to wage a war against upstart empire...

Once Turkey surrenders, I am left in war against... what? Lets sign peace, nope... I need to be losing to sign peace... Then stupid AI and strict diplomacy strikes in, Romania is too scared to fight alone so they call in my good friend, Commonwealth (leaving them without any oil...). And then I am in war against all Allies because reasons. Tried to google out solution, it gave up and stopped responding, ugh...

Is there a way to end this bloodshed? I have Tibet to conquer ;)