By Steve Holland and Jeff Mason WASHINGTON (Reuters) -President Joe Biden unveiled harsh new sanctions against Russia on Thursday after Moscow launched an all-out invasion of Ukraine, imposing measures to impede Russia’s ability to do business in the world’s major currencies along with sanctions against banks and state-owned enterprises. “This is a premeditated attack,” Biden told reporters at the White House, saying Russian President Vladimir Putin rejected attempts by the West to engage in dialogue and had violated international law. “Putin is the aggressor. Putin chose this war. And now he …