<h1>10% ad valorem tariff on imports from eight countries over Greenland control sparks conflict with EU single-market and legal challenge</h1> The instrument announces imposition of a 10% ad valorem tariff on imports from eight states (Denmark, Norway, Sweden, France, Germany, the United Kingdom, the Netherlands and Finland) as leverage over control/status of Greenland, effecting a new trade barrier on goods from those states. It asserts exercise of emergency economic powers under US law as a possible legal basis, creating immediate legal uncertainty because enforcement against EU member states may collide with the EU single-market trading regime and because those domestic emergency powers are subject to Supreme Court challenge, prompting coordinated diplomatic and trade-response mechanisms.