If Donbas was at the time part of Russia it would be like that. So it's not really like that. Since North Korea actually went into South Korea with the intention of taking it over.
North started the war and US and other UN troops only came in to help the South after that. The whole thing could've possibly been avoided had the North not attacked.
The South did invade the North though in the US civil war.
The Maryland campaign (or Antietam campaign) occurred September 4–20, 1862, during the American Civil War. The campaign was Confederate General Robert E. Lee's first invasion of the North.
And if you don't want to use the word "invaded", I guess you could just say that North Korea attacked the South, kicking off the war
Reasoning is viable in that it sucks for people living there. But so does invasion. If land mines can do deterrence, it definitely is going to act as a net positive.
You think North Korea invading South Korea was to liberate North Korea from foreign rule...? Wut
This is more like when Americans went into Canada to "liberate" them