The United States and United Kingdom are implementing restrictions on the trade of new Russian-origin metals, including aluminum, copper, and nickel, on global metal exchanges and in derivatives trading.

The announcement is part of the Group of Seven nations’ commitment made in February to reduce Russia’s revenues from metals as its invasion into Ukraine continues for more than two years.

Russia is a major exporter of metals like aluminum, steel, and titanium. However, British and American officials, speaking anonymously to preview the announcement, indicated that the economic impact from the ban would be minimal for consumers and producers.

The goal is to limit Russia’s earnings from metals, which have totaled $40 billion over the past two years, according to British officials.

“Our new prohibitions on key metals, in coordination with our partners in the United Kingdom, will continue to target the revenue Russia can earn to sustain its brutal war against Ukraine,” said Treasury Secretary Janet Yellen in a news release.

“By taking this action in a targeted and responsible manner, we will reduce Russia’s earnings while protecting our partners and allies from unwanted spillover effects,” she added.

Under the new measures, new Russian metals will not be permitted for trading on exchanges such as the London Metal Exchange and Chicago Mercantile Exchange. However, metals produced before midnight Saturday in London will be exempt.

Since Russia’s invasion of Ukraine, the United States and European Union have imposed sanctions on Russia’s major banks and elites, frozen assets of Russia’s Central Bank held abroad, and excluded Russian financial institutions from the SWIFT bank messaging system.

The United States and United Kingdom have also previously sanctioned Russian gold, gas, and diamonds.