As Xi Jinping, China’s leader, meets with President Vladimir V. Putin of Russia in Moscow this week, Chinese officials have been presenting his trip as a mission of peace. But American and European officials are watching for something else altogether — whether Mr. Xi will add fuel to the full-scale war that Mr. Putin began more than a year ago. Edward Wong explains what Mr. Xi is really up to, and why it’s making people wonder whether a new Cold War is underway. Guest: Edward Wong, a diplomatic correspondent for The New York Times.