中俄蒙，正式签署！

Group 1 - The core viewpoint of the article is the signing of the "Silk Road Tea Route" tourism cooperation development plan by China, Russia, and Mongolia, aimed at enhancing cultural and economic value through tourism collaboration [1] - The plan includes measures such as jointly developing and promoting tourism routes and sites along the "Silk Road Tea Route," launching a cross-border self-driving tour brand, and improving cross-border tourism facilitation [1] - The "Silk Road Tea Route" extends from Wuyi Mountain in Fujian, China, to Saint Petersburg, Russia, passing through the three countries, and has seen increased efforts in tourism cooperation in recent years [1]