Jeremy Bowen (BBC) concludes that:
'The risk is that, if Trump sticks to his course, he will push the world back to the way it was in the age of empires a century or more ago - a world where big powers, with spheres of influence, sought to impose their will, and where mighty authoritarian nationalists led their peoples to disaster'...
That's not a risk, its the emergent reality - the Tangerine Tyrant is taking us back to the international relations of C19th!