Buffett has been trimming his stake in the electric vehicle and battery maker this year, with the first share sale reported in August

Toyota has been reviewing a $30 billion, three-stage plan for developing and releasing electric vehicles it announced late last year

If successful, the IPO would be the first major US float of a Chinese firm since Beijing tightened its grip over Chinese companies' overseas share sales in July last year

If successful, VinFast will be Vietnam's first company to list in the United States

The two sides are discussing a reduction in Renault's 43% stake in Nissan, potentially to 15%, so the carmakers can collaborate on more equal terms