US President Barack Obama has laid out a broad vision of American leadership in a changing world, in a UN speech, the BBC reports.
He told the UN General Assembly the world needs a new blueprint to deal with the terror, conflict, climate and health challenges it faces.
The president said the Ebola outbreak, Islamist militancy and Russian aggression needed addressing.
He added the world was at a crossroads between “war and peace”, “disorder and integration”, and “fear and hope”.
Mr Obama told representatives of 193 nations, “On issue after issue, we cannot rely on a rule-book written for a different century.”
“If we lift our eyes beyond our borders – if we think globally and act co-operatively – we can shape the course of this century as our predecessors shaped the post-World War Two age.”
Sharply critical of Russian actions in Ukraine, Mr Obama said it was an example of what happens when countries do not respect international laws and norms.
He called on Russian President Vladimir Putin to follow “the path of diplomacy and peace and the ideals this institution is designed to uphold”.