A diplomatic spat is deepening between China and the US as they accuse one another of sending up spy balloons into each other’s airspace.
Just 12 days ago the world was gripped by the appearance of a large suspected Chinese spy balloon floating over the USA.
Since then three more flying objects have been taken down by fighter jets over Alaska, Canada and MIchigan.
The origin of these ones – officially at least – remains a mystery.
For more on China’s position over the balloons, we speak to the Chinese Professor Victor Gao, who was also the translator for former Chinese leader Deng Xiaoping.