London: Nazanin Zaghari-Ratcliffe is to go on hunger strike in her jail cell to show solidarity with another dual citizen detained in Iran, as the regime urged Western countries to stay out of its legal affairs.

Zaghari-Ratcliffe, a British-Iranian woman who was jailed in 2016 on spurious charges of spying, will join Kylie Moore-Gilbert, a British-Australian academic, in refusing food.

Moore-Gilbert, a University of Melbourne Islamic studies lecturer, is serving a 10-year prison sentence on spying charges. She has demanded at minimum to be moved out of solitary confinement, according to The Guardian.

"Five days on dry hunger strike is becoming critical, and our thoughts go out to Kylie and her family for all this ordeal," said Richard Ratcliffe, Nazanin Zaghari-Ratcliffe's husband. He added: "It gives some sense of just how desperate 16 months in solitary makes you. At some point you really feel you have nothing left to get noticed, nothing left to lose."