China will send a high-ranking delegation to its isolated neighbour North Korea later this week to mark the 75th anniversary of the establishment of diplomatic relations between the two countries. At Pyongyang’s invitation, Zhao Leji, a top politician from the Chinese Communist Party’s inner circle, will lead the group on the trip that runs Thursday to Saturday, Foreign Ministry spokeswoman Mao Ning said in Beijing on Tuesday. The visit shows the importance China attaches to relations with North Korea, she said. The visit comes at a time when North Korea is working to increase its cooperation …