What on earth has been happening during these three years of the leader's term?

During the Moon administration, North Korea removed landmines on its own, so why is it that under the current leader, we just stand by and watch even when North Korea plants mines on our territory, causing our soldiers to get injured? They don't even carry out preemptive strikes. Even during the Yeonpyeong Island shelling, when bombs were falling all day, they just watched, and even when the Cheonan sank, they just stood by. I cannot understand these traitors.