People flocked to the Ueno Zoo in Tokyo to say goodbye to the last two giant pandas in Japan. Xiao Xiao and Lei Lei will return to China.

Japan's Ueno Zoo is returning the country's last two pandas to China at a time when relationships between the two countries have hit an all time low.

CNBC's China reporter Elaine Yu chats with Squawk Box Asia anchors Martin Soong and Chery Kang about the so-called "panda diplomacy", as Japan is due to return two pandas to China amid rising tensions.