World leaders are meeting in Brisbane, Australia, for the first day of the G20 summit, the BBC reports on Saturday.
The two-day summit, attended by the US, Chinese and Russian leaders among others, will focus on promoting economic growth.
In his speech, US President Barack Obama sought to reassure Asia-Pacific allies of the US' commitment to the region.
Russian President Vladimir Putin is expected to face a hostile reception from some Western leaders concerned about Russia's increasing military assertiveness.
G20 summit starts in Brisbane, Australia
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