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.

Russian oil exporters are predicted to take in $153 billion this year, according to the Kyiv institute. Fossil fuels are the single largest source of budget revenue. The imports support Russia’s ruble currency and help Russia to buy goods from other countries, including weapons and parts for them.

US President Donald Trump’s administration has drawn criticism for imposing additional tariffs on India over its continued imports of Russian oil while letting China by far the largest purchaser of Russian energy off the hook.