What is EU's 'trade bazooka', endorsed by Macron against Trump's Greenland tariffs?

French President Emmanuel Macron has called for use of 'trade bazooka' against US President Donald Trump's 10% tariff threat on European countries amid Greenland row. The Anti‑Coercion Instrument was adopted in 2023 to protect European Union from economic pressure by non‑EU countries. It allows EU to adopt countermeasures if a foreign power uses trade restrictions to coerce political decisions.