Washington - U.S. lawmakers moved Tuesday to give the administration of President Joe Biden expanded authority to enforce sanctions on Russia for the unprovoked invasion of Ukraine earlier this year.

Republican Senator Pat Toomey and Democratic Senator Chris Van Hollen introduced a framework supporting the administration's efforts, along with G-7 leaders, to cap the price of Russian oil exports.

FILE - Sen. Pat Toomey, R-Pa., speaks on Capitol Hill in Washington, Oct. 2, 2018.

'We're effectively depriving the Russian government of the profits that they probably are using to fund this war,' Toomey told reporters on a press call Tuesday. 'We're going to demonstrate whether or not the free world has the resolve to prevent a brutal autocrat from redrawing international boundaries because he thinks he can.'

The United States and G-7 allies are expected to agree on a price cap for Russian oil exports by December, around the time a European Union oil embargo also goes into effect.

'If you want to set a worldwide price cap on Russian oil, you need to ensure that it's uniformly applied. And to do that, we believe you need the backup of the secondary sanctions. Otherwise, Russia will exploit big loopholes. And there are other countries like China that are already dramatically increasing their imports of Russian oil,' Van Hollen told reporters Tuesday.

FILE - Sen. Chris Van Hollen, D-Md., questions a witness on Capitol Hill in Washington, Jan. 16, 2019.

'If the price cap works, just as the administration hopes and we hope, then sanctions are never triggered, because you have a worldwide price gap. These sanctions will only trigger if the administration is not successful at achieving that uniform price,' Van Hollen said.

The framework calls for monitoring Russian oil purchases and would allow Biden to impose sanctions on countries and financial institutions that attempt to profiteer off a cap on Russian oil.

Since Russia's February 2022 invasion of Ukraine, the United States has imposed harsh sanctions on Russian President Vladimir Putin, Russian oligarchs and the Russian banking industry.

The U.S. and its allies also cut off Russian access to Western banking institutions and blocked many of Putin's family members and friends from traveling abroad.

The U.S. Treasury Department 'has sanctioned hundreds of Russian individuals and entities, and this includes a majority of Russia's largest financial institutions, key nodes and Russia's military, industrial supply chains, and the oligarchs and cronies who helped perpetuate Putin's war,' Elizabeth Rosenberg, assistant secretary for terrorist financing and financial crimes at Treasury, told lawmakers earlier Tuesday.

'The United States has been joined by over 30 countries collectively representing more than half of the global economy and imposing sanctions, the largest sanctions regime in modern history,' Rosenberg said.

Rosenberg told lawmakers the threat of a price cap was already having an impact on the global market, changing the behavior of countries that have not imposed it.

'They can no less use the existence of the price cap to leverage lower prices from Russia. And in fact, we're seeing that already where Asian purchasers have used the price cap in order to leverage lower prices, cut rate prices for Russian energy. That's this policy already at work,' she said.

The Toomey-Van Hollen framework is set to become the first major bipartisan Russian sanctions legislation introduced in Congress since this February.