Masuko's final years at Mitsubishi were marked by a crisis not of Mitsu's making: the shock waves that rippled through the expanded alliance forged with Nissan and Renault in 2016 following the arrest of alliance boss (and Mitsubishi chairman) Carlos Ghosn in November 2018. Masuko stepped in to resume the chairman duties he vacated to Ghosn two years earlier, lending the company a measure of stability as tensions flared between Nissan and Renault.