Chinese President Xi Jinping shakes hands with U.S. Vice President Joe Biden (L) inside the Great Hall of the People in Beijing December 4, 2013.

The U.S. and China represent the most significant – and potentially most perilous – bilateral relationship in human history.  Given that reality, neither side is managing their rising tensions with adequate skill or durable strategy.

That's the way Stephen Heintz of the Rockefeller Brothers Fund put it in a conversation with me a couple of days ago. It is also the subtext of conversations I've had with world leaders visiting Washington, D.C. this week for the IMF and World Bank meetings.