The Group of Seven nations and Australia joined the European Union on Friday in adopting a $60-per-barrel price cap on Russian oil, a key step as Western sanctions aim to reorder the global oil market to prevent price spikes and starve President Vladimir Putin of funding for his war in Ukraine.

Europe needed to set the discounted price that other nations will pay by Monday, when an EU embargo on Russian oil shipped by sea and a ban on insurance for those supplies take effect. The price cap, which was led by the G-7 wealthy democracies, aims to prevent a sudden loss of Russian oil to the world that could lead to a new surge in energy prices and further fuel inflation.

U.S. Treasury Secretary Janet Yellen said in a statement that the agreement will help restrict Putin’s “primary source of revenue for his illegal war in Ukraine while simultaneously preserving the stability of global energy supplies.”

The agreement comes after a last-minute flurry of negotiations. Poland long held up an EU agreement, seeking to set the cap as low as possible. Following more than 24 hours of deliberations, when other EU nations had signaled they would back the deal, Warsaw finally relented late Friday.