US President Donald Trump’s unilateral announcement of a “colossal” South Korean investment package has prompted Seoul to clarify that the deal is far from finalised, laying bare stark differences between the allies over the terms of their trade agreement, observers have said. On Wednesday, Trump announced that South Korea would invest in the construction of a natural gas-fired power plant in Texas, eight large-scale nuclear power plants across the United States and a liquefied natural gas (LNG)...