Tensions at last week’s Nato summit in London reflect underlying doubts about the leadership and commitment of US President Donald Trump to trans-Atlantic security. Mr Trump's insistence that the United States “cannot continue to be the policeman of the world” causes trepidation in European nations, Japan and South Korea, which are dependent on American security and economic guarantees. But his abandonment of the liberal international order also presents a historic opportunity for independent rising nations like India, Turkey, Brazil and Nigeria to fill the vacuum being left by a tired US. These countries have strong anti-colonial traditions and ambitions to transform and lead their regions in the wake of Mr Trump's “America First” apathy and an expansionist China