French President Emmanuel Macron told Prime Minister Shinzo Abe that he's worried about Carlos Ghosn's conditions in jail, making his strongest comments yet on the fallen car titan and the scandal that has rocked Renault SA's decades-old alliance with Nissan Motor Co.

"All I'll say is that I felt the detention was too long and too hard, and I told Abe that," Macron told reporters in Cairo, referring to a telephone conversation with Abe last Friday. "I'm just concerned that the case of a French citizen should respect basic decency."

Macron's views came days after Ghosn stepped down as chairman and chief executive officer of France's largest carmaker and two months after Nissan booted him out, with the attention shifting to the future of the partnership.