The big story of 2014 will be Iran. Of course, the big story of the early 21st century will never stop being US-China, but it’s in 2014 that we will know whether a comprehensive accord transcending the Iranian nuclear program is attainable; and in this case the myriad ramifications will affect all that’s in play in the New Great Game in Eurasia, including US-China.
As it stands, we have an interim deal of the P5+1 (the UN Security Council’s five permanent members plus Germany) with Iran, and no deal between the US and Afghanistan.