Prime Minister Anthony Albanese has vowed to keep up his advocacy for Australians after he received a letter from the children of a man imprisoned in Beijing, urging him to bring their father home.
Yang Hengjun was arrested in August 2019 on suspicion of espionage and has spent more than four years in a Beijing prison.
The academic's two sons in Australia have renewed their pleas after last week receiving a letter from their detained father.
