Donald Trump has signaled support for a US bill that could impose a 500% import duty on countries buying oil from Russia. Introduced in April 2025, the legislation aims to penalize nations financing Russia's war in Ukraine through oil sales. Trump's backing, following stalled peace efforts, is seen as a move to increase pressure on Moscow. The bill's resurgence also coincides with an impending US Supreme Court ruling on tariff legality, potentially offering an alternative.