The way Yugoslavia is handled in SOE is very rudimentary - pretty much just relying on the arbitrary randomized dates of 1941/03/03, 1941/04/04, 1941/04/26 to kick off the Coup - regardless of much of the political landscape at hand.
I have been critical of the current implementation, which I am hoping to eventually address myself.
1. Yugoslavia starts at Axis(45), which is crazy pro-Axis, historically.
2. The subsequent events that did push Yugoslavia->Axis that are not implemented in SOE, such as:
a. Fall of Belgium
b. Fall of France
c. Withdrawal of UK from continental Europe
c. 2nd Vienna Award (regardless of the outcome)
d. Hungary joining Tripartite Pact
e. Romania joining Tripartite Pact
f. Bulgaria joining Tripartite Pact
g. UK refused to offer meaningful support towards Yugoslavia, like they did for Greece.
h. Bulgarian-Turkish Pact
i. The ongoing Italian-Greeco war.
j. Refusal of USSR to enter into any military treaty/alliance with Yugoslavia.
l. Ongoing delays in the US getting Lend-Lease passed Congress and functional.
3. The Axis DoW on Greece actually further isolated Yugoslavia, especially with no real assistance being put forward by the UK.
You can see from here:
https://history.state.gov/historicaldoc ... 41v02/d934 that Yugoslavia is very aware and distressed over their political and military situation. The UK was not being forthcoming with meaningful help either as they felt Yugoslavia should be doing more - as if they could.
Over the next few months, Prince Paul and his ministers laboured under overwhelming diplomatic pressure, a threat of an attack by the Germans from Bulgarian territory, and the unwillingness of the British to promise practical military support.
The fact that a Coup took place at all is really more of fluke of events than anything else. There is still much debate over who was the primary instigators - with nobody wanting to claim credit or involvement. Even after the Coup, the Yugoslavian government was still trying to negotiate a signage of the Tripartite pact. But Hitler is thoroughly pissed at this point.
see -
https://en.wikipedia.org/wiki/Yugoslav_ ... evaluation
On 30 March, Foreign Minister Momčilo Ninčić summoned the German ambassador, Viktor von Heeren, and handed him a statement which declared that the new government would accept all its international obligations, including accession to the Tripartite Pact, as long as the national interests of the country were protected. For his part, Heeren demanded an apology for the anti-German demonstrations, immediate ratification of the Tripartite Pact, and demobilisation of the Yugoslav armed forces. Heeren returned to his office to discover a message from Berlin instructing that contact with Yugoslav officials was to be avoided, and he was recalled to Berlin, departing the following day.
There was ample opportunity to fully develop and explore the sequence of causes and consequences that led to the the Balkan 1940/1941 crisis... some really involved political machinations were at play here.