President Barack Obama#39;s preferred path to end the Iranian nuclear standoff faces a stern test this week when world powers sit down with Iran in another bid to press it to meet international demands to prove it is not trying to develop nuclear weapons. Failure will strengthen calls for military action.

A growing diplomatic dispute over Pakistan#39;s refusal to reopen supply routes for U.S. and other troops in Afghanistan threatened to overshadow President Barack Obama#39;s efforts on the last day of the NATO summit to finalize plans for ending the unpopular war.

US President Barack Obama has urged Europe to strengthen defences against financial market turmoil and recapitalise banks to help tackle the eurozone crisis.

Barack Obama has left Pakistan off a list of nations he thanked for getting war supplies into Afghanistan.

Democrats express discomfort at increasingly aggressive tactics.