I don't think they are that ethnonationalist. South Korea has recently increased their foreign population and a lot of Koreans immigrate to other countries. Han Chinese living in China are about 1.3 B, so of course this has to be taken into account for China. But still they had the one child policy and some Chinese are working in Nike factories for 30$ per month; do you consider this nationalistic?

There's zero nationalism in mid East or Africa.

Are you going to play with words now? Tribes/clans are based on genetic lines and it gets messy because their countries' borders are not drawn on ethnic lines. But this is their expression of nationalism, which is certainly recognisable for Whites living in Africa. In the middle East, they also have a pan-Arab islamic identity apart from national identity; is this suppossed to invalidate the latter? I have no idea what you mean with the arab army not fighting conventional wars. If this is related to the US, why would they fight a conventional war against a stronger opponent?

Germany was nationalistic because Hitler took power, otherwise it was in the process of dissolution. Sweden wasn't nationalistic, they didn't even have an army in the WW2 but rather militias.