Geneva, April 9 -- The United States has opened a new front in its trade war with the European Union by threatening to impose additional duties on $11 billion of European goods under the US Section 301 provisions. The US claimed Monday the EU has failed to remove "those subsidies" found to be inconsistent by the World Trade Organization's Appellate Body with the core provisions of the WTO's Agreement on Subsidies and Countervailing Measures in the festering tit-for-tat trade war between two civil aircraft behemoths Boeing and Airbus....