If any politician has the manner to ease tensions with Beijing, it’s Janet Yellen. America’s treasury secretary comes throughout as a twinkly eyed professor, somewhat than a foreign-policy hawk. Positive sufficient, she used a current journey to China, which ended on April ninth, to reward the “stronger footing” that Sino-American relations at the moment are on in contrast with a yr in the past. Ms Yellen was not merely there to increase an olive department, nevertheless. She additionally carried a warning for China’s banks: those who assist “channel army or dual-use items to Russia’s defence-industrial base expose themselves to the danger of US sanctions”.