US Secretary of State Hillary Clinton on Monday said Washington would use "all elements of its power" to prevent Iran going nuclear and was working in "close consultation" with Israel over how to do so.
Russian President Vladimir Putin did not budge Thursday during talks with his Ukrainian counterpart Viktor Yanukovych aimed at easing a dispute over the price of Russia's gas.
French President Francois Hollande and British Prime Minister David Cameron tried Tuesday to laugh off a rocky start to their relationship despite lingering differences over the eurozone crisis.
Eurozone finance ministers agreed Tuesday to offer Spain 30 billion euros this month to help its distressed banks as they raced to stay ahead of market scepticism.
International envoy Kofi Annan has arrived in Syria after admitting that his peace plan has so far failed to end nearly 16 months of carnage, as scores more die in the violence-wracked country.
The United States has designated Afghanistan a major non-NATO ally, giving the war-torn country special privileges as the US prepares to pull its troops out in 2014.
Cuban President Raul Castro begins talks with China's leaders on Thursday during which he is expected to win backing from his country's longtime ally in helping to implement historic economic reforms.