China’s armed forces secretly trained about 200 Russian military personnel in China late last year and some have since returned to fight in Ukraine, according to three European intelligence agencies and documents seen by Reuters.While China and Russia have held a number of joint military exercises since Moscow’s full-scale invasion of Ukraine in 2022, Beijing has repeatedly stated that it is neutral in the conflict and presents itself as a peace mediator.The covert training sessions, which predominantly focused on the use of drones, were outlined in a dual-language Russian-Chinese agreement signed by senior Russian and Chinese officers in Beijing on…