Donald Trump is moving fast and breaking things, but that may result in a better US | Simon Jenkins

Donald Trump is being a cultural revolutionary, a Mao Zedong , a grandiloquent system smasher.

He wants to reorder Washington 's role in the US and the US ’s role in world.

Already a dose of the so-called new realism has torn through Nato 's cobwebs.

Trump simply does not regard Russia as a threat to US and western Europe .

As it is, the chance of Trump succeeding in his radicalism is small.

But in among the chaos are challenges to convention that were overdue.

Nato could become realistic and Russia readmitted to the community of nations.

More to the point, the US may review its role in the world, a role that has meant a quarter of a century of moral belligerence.