Eight years into the conflict, the peace process is again being challenged as heavy clashes between the Yemeni army and the Houthi militia are reignited. Saudi Arabia's former intelligence chief Turki Al-Faisal said the U.S. is not an "honest broker" between Saudi Arabia and Iran. Professor Wang Jin, a specialist in Middle East Studies at China's Northwest University, says the U.S. does not play a fair role in the Middle East peace process.