德国外长：美国已经做好了考虑对俄罗斯实施额外制裁的准备。

Group 1 - The core viewpoint of the article is that the U.S. is prepared to consider additional sanctions against Russia, as stated by the German Foreign Minister [1] Group 2 - The readiness of the U.S. to impose further sanctions indicates a potential escalation in geopolitical tensions [1] - This development may impact various sectors, particularly those with ties to Russia, including energy and finance [1] - The announcement reflects ongoing international efforts to respond to Russia's actions and could lead to significant market reactions [1]