In a libertarian socialist society, there are no leaders as it functions as either a direct democracy or a liquid democracy. Like I said, they were destroyed by fascists around the start of WW2 (1939) and after that they became part of Spain again.
Also, Yugoslavia was not a libertarian socialist system, that may not have been clear in my post. It was a federal republic, not unlike the USA, Nepal, or Germany. That puts it as being more authoritarian than libertarian, though nowhere close to the degree of the USSR.
While the rise of nationalism in Yugoslavia was in part driven by the economic crisis, things could've gone a different way had there not been a rise in nationalism. A good chunk of the Yugoslav Wars was driven by nationalism.
In 1989, Yugoslavia had an external debt of USD$17B, or about 19.2% of its GNP.
For comparison, today, the USA has an external debt of USD$21.3T, or about 98.8% of its 2019 GNP (roughly ~140% of its 2020 GNP due to the pandemic). Debt isn't the only factor, else the USA would be a wasteland right now.
Syria and the NES are different governances entirely, given the region's ongoing civil war that should've been more clear. The NES has a population of around 2 million and is currently not recognised by any major government. They currently have 23 represented political parties and operate under a federated semi-direct democracy, with a goal of moving as close to direct democracy as possible over time.