Kolkata, Mar 30 (ANI): Governor of China’s Yunnan province, Li Jiheng during an exclusive business meet in West Bengal hailed the economic engagement between Kolkata and Yunnan. Jiheng said that ties between Yunnan and West Bengal is the only sub national cooperation mechanism between China and India. Jiheng also added that during a meeting between the Chinese Premier Li Keqiang and Prime Minister Manmohan Singh, Kunming and Kolkata officially entered into sister ties.