CCTV interview: Obama's strategy on Afghanistan

We're now joined live by our correspondent Nathan King, who's in West Point. He will give us more insight into President Obama's strategy on Afghanistan. Hello, Nathan.

Q1. The top US commander in Afghanistan, General Stanley McChrystal, asked Washington to send 40-thousand more troops. But President Obama has decided to send fewer. Why?

Q2. We know that sending more troops means spending more money. How much will these extra troops cost?

Q3. With the weak economy and high jobless rate at home, many Americans are skeptical about the move. Why is President Obama still sending more troops to Afghanistan?

Q4. President Obama's European allies are unlikely to send as many troops to Afghanistan as he wants. Could this undermine his strategy?