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President Obama wants to rebuild relations with Russia when he visits Moscow next week, but the very thing that sent them tumbling – Russia's invasion of Georgia last summer – is far from resolution.

Tensions between Russia and that former Soviet republic are worsening. "Extensive fighting could erupt again," warns the International Crisis Group, a think tank.

It's been almost a year since Russia and Georgia were embroiled in fighting, with Russian tanks penetrating deep into Georgia's territory.