They have tested all of the components, notably in the view of their enemies, but they have yet to show the world a test of the the full enchilada ( a nuclear capable ICBM with r/v). No credible intelligence agency would, in it's own proprietary estimation, consider the DPRK to be incapable of hitting the continental US with a nuclear warhead. Trump must now take this into consideration: The fact that if he inadvertently convinces the DPRK's leadership that they are under threat (by sabotage, assassination, anything) there is a non-insignificant probability they could plant a fat one on the white house or Mar-a-Largo and end his presidential pity party in absolutely spectacular fashion.