Russia accused the United States on Tuesday of exerting illegal trade pressure on India after U.S. President Donald Trump threatened again to raise tariffs on India over its purchases of Russian oil.

President Donald Trump said he will “substantially” raise tariffs on India because it’s still buying Russian oil.

Russia is one of India’s top oil suppliers and trade partners, contributing to around 35% of the country’s total supplies.

Democratic-led states and U.S. businesses challenging tariffs in court argue that IEEPA does not cover tariffs, and that Congress has authority over tariffs and taxes.

The tariffs U.S. President Donald Trump imposed last week on scores of countries are likely to stay in place rather than be cut as part of continuing negotiations, Trade Representative Jamieson Greer said on Sunday.