Only they have, abet in a limited way and the SK and US response was also limited to avoid escalation. I don't think they are harmless but I also don't think t

Only they have, abet in a limited way and the SK and US response was also limited to avoid escalation. I don't think they are harmless but I also don't think they are suicidal, this just happens to be the only leverage they are willing to use. https://en.m.wikipedia.org/wiki/Bombardment_of_Yeonpyeong https://en.m.wikipedia.org/wiki/Bombardment_of_Yeonpyeong