The suit seeks US$280 million from Cuba-Petroleo (Cupet) and Cimex, which operates service stations on the island nation.
Exxon Mobil said last year it would deliver the LNG starting in the early 2020s, while LNG supplies to China would come from its global portfolio.
China is allowing greater access by global majors and local independents to its massive chemicals market.
Huang was recently a Singapore-based crude trader for Chinese independent refiner Wonfull Petrochemical, purchasing feedstock for its Shandong refinery and carrying out hedging activities.
The project is aimed at increasing the competitiveness of ExxonMobil’s Singapore refining-petrochemical complex.
Six Malaysian students lead country to 37th position in this year’s International Mathematical Olympiad.