China is Afghanistan's biggest business investor - thanks to a $3bn deal for the rights to a copper-rich area outside Kabul.

But there are no Chinese miners there; the promised roads and railways have not been started as security concerns have stalled the project.

In China, Afghan President Ashraf Ghani is hoping to revive this deal as Chinese investment in his country's minerals is worth an estimated $1tn.

So, will President Ashraf Ghani close the deal? And what does this mean for the United States? From Kabul, Jennifer Glass looks at China's investment in Afghanistan.

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