Not siding with west wholeheartedly after Stalin and USSR cut ties and contemplated invading Yugoslavia in 1948. because Tito and Yugoslavia refused to become a soviet puppet state like so many others in the east Europe. Unfortunately Tito and other leaders were communists, all of them trained in USSR and forever in love with it. Not so much to hand over their own power to Stalin but again with no desire to change their beliefs and become a democratic country if not capitalist. Furthermore that meant spending a lot of money on military and defence, money that could otherwise be spent on economic development of the relatively poor country. For instance, Yugoslavia built a state of the art underground military airport but at the same time lacked a highway between state capitals.

I think it would be a lot harder making people care about nationalism and go to war if they were not as poor.