Japan’s trading company Mitsui & Co is in an advanced stage of talks with QatarEnergy to buy a minority stake in one of Qatar’s mega expansion projects, anonymous sources with knowledge of the development told Reuters on Friday. Qatar’s state firm QatarEnergy is undertaking the world’s biggest LNG expansion project with multiple phases of expanding the export capacity of the offshore North Field, the world’s largest non-associated natural gas field, which Qatar shares with Iran. Mitsui is close to buying…