A brutal megalomaniac dictator only understands the stark/blunt reality of being defeated militarily and the resulting consequences for himself (not his 'subjects'/victims/supporters). ‘A leopard cannot change its spots’.
https://www.hongkongfp.com/2017/08/11/trump-warns-north-korea-nervous-urges-china/ reported that Ronald Trump said, "If North Korea does anything in terms of even thinking about an attack on anybody we love or we represent or our allies or us, they can be very, very nervous...and they should be… because things will happen to them like they never thought possible.”
Donald Trump is basically 'reading the riot act' by saying read my lips. US is ready and armed to the hilt military – so don’t take us on. If you do so, it will be to your overwhelming peril, disaster, destruction. I then will take 'no stone unturned' to ensure you, Kim Jong-Un, be taken out ('by hook or by crook') from being leader of North Korea.