Are you familiar with the Korean war? There was a massive conflict which got drawn out into a stalemate and everybody agreed a temporary ceasefire was preferable to even more destruction.
Trying to topple a regime that has nothing to lose and a highly indoctrinated population is not an easy ask. We can only hope that like most authoritarian regimes they eventually succumb to the weight of their own opression. It's better than torching the whole continent in the name of freedom.
Well Trump had a go in his first term but unsurprisingly didn't get far.