<h1>US imposes 50% tariff under national security on imports linked to Russian oil purchases, warns of more sanctions</h1> The United States has imposed an additional 25 percent tariff on imports from a country purchasing Russian oil, increasing the total tariff to 50 percent, the highest levied by the US on any nation. This action follows an executive order citing national security concerns related to Russian oil imports. The US indicated potential secondary sanctions and hinted at similar measures possibly extending to other countries engaged in Russian oil purchases. The affected country's government condemned the tariffs as unfair and unjustified, emphasizing its energy security needs and signaling intent to protect its national interests. The tariffs create a competitive disadvantage for the country's exports to the US compared to other regional competitors with lower duties. This development occurs amid ongoing bilateral trade negotiations between the US and the affected country.