ST PETERSBURG - Russia's President Vladimir Putin Thursday warned world leaders at the G20 summit being hosted here by Russia that a global economic recovery was not yet assured as there were still risks of sliding back into crisis. Focusing on the challenges ahead, Putin said, "Our main task is returning the global economy towards steady and balanced growth. This task has unfortunately not ... - See more at: http://www.thailandnews.net/#sthash.DAoNuk7g.dpuf