President Joe Biden said the U.S. will ban imports of Russian fossil fuels including oil, a major escalation of Western efforts to hobble Russia’s economy that will further strain global crude markets.

"The United States is targeting the main artery of Russia’s economy,” Biden said Tuesday in Washington. "We will not be part of subsidizing Putin’s war.”

The U.S. move will be matched in part by the U.K., which announced a ban on Russian oil imports, though it will continue to allow natural gas and coal from the country. Other European nations that rely more heavily on Russian fuels will not participate.