U.S. President Donald Trump's tirade against India over trade and Russian oil purchases threatens to undo two decades of diplomatic progress, analysts and officials say, and could derail other areas of cooperation as domestic political pressures drive both sides to harden their stances.

A bill vowing levies of up to 500% on countries that buy Russian oil is making its way through Congress. Meanwhile, the European Union’s 18th package of sanctions will ban refined products made from Russian crude in January.

President Donald Trump signed an executive order Wednesday to place an additional 25% tariff on India for its purchases of Russian oil, bringing the combined tariffs imposed by the United States on its ally to 50%.