Leaders from rich and poor nations hailed the G20 as the premier global forum for economic co-operation, but critics warned the Toronto summit showed it risks becoming just another talking shop.

One-by-one, G20 leaders exited the two-day gathering claiming both victory and unity, a transatlantic spat over how to keep economic recovery on track seemingly brushed aside.

US President Barack Obama, whose administration went into the pow-wow tersely warning Europe its policies were plain wrong, described the meeting as reaching a "violent agreement".

Whereas Washington had just hours before cast Europe as hell bent on derailing the global recovery, Obama later urged onlookers...

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