North Korea tried to reunify it's own country, they weren't really attacking another per se. Kind of like how the Philippines is pushing native inhabitants in the South off their own land, turning them into a minority.
Moro people - Wikipedia, the free encyclopedia
"Today, the Moro people are still disadvantaged by opportunities and pushed out of their ancestral lands compared to the majority Christians in terms of employment and housing; they are frequently misportrayed and discriminated against in the media as scapegoats or warmongers.
[29] This has established escalating tensions that have contributed to the ongoing conflict between the Philippine government and the Moro people. In addition, there has been a large exodus of Moro peoples (
Tausug,
Samal,
Bajau,
Illanun,
Maguindanao) to
Malaysia (
Sabah) and
Indonesia (
North Kalimantan) over the last 30 to 50 years, due to the illegal annexation of their land by the Christians, and armed militias such as the
Ilaga has divided the trust between Settler and Moro communities. Land Tenure Laws has changed the population statistics of the Bangsamoro to a significant degree, and has caused the gradual displacement of this indigenous from their traditional lands."