Questions and concerns about Japan are swirling internationally over its treatment of ousted Nissan Motor Co. Chairman Carlos Ghosn, whose detention was extended following his arrest last week over alleged financial misconduct.

The arrest of the 64-year-old executive, viewed as the automaker's savior, came out of the blue. Prosecutors were waiting for him as he arrived at Tokyo's Haneda airport on a business jet on the evening of Nov. 19.

Ghosn, known as one of Japan's highest paid executives, is confined to a 7-square-meter room at the Tokyo detention center in the northeastern part of the capital, according to the Justice Ministry. The room's window is designed so the detainee cannot look outside.