Renault shares fall on worries Nissan alliance doomed without Ghosn

PARIS/TOKYO (Reuters) - Renault shares hit six-year lows on Monday as investors worried the French automaker's 20-year cost-sharing alliance with Nissan is headed for a break-up without Carlos Ghosn to hold it together.Long-standing tensions in the Franco-Japanese partnership have been heightened since Ghosn's arrest in Tokyo in November 2018 on allegations of financial misconduct, which he denies.Following a dramatic flight from Japanese justice late last month, Ghosn called the alliance a..