The agreement will see the US provide the EU with extra gas, equivalent to around 10% of the gas it currently gets from Russia, by the end of the year.
The bloc has already said it will cut Russian gas use in response to Russia's invasion of Ukraine.
Russia currently supplies about 40% of the EU's gas needs.
The new deal will involve the US and other countries supplying an extra 15 billion cubic metres of gas on top of last year's 22 billion cubic metres.
The new total will represent around 24% of the gas currently imported from Russia.
The eventual aim is for the US and international partners to provide about 50 billion cubic metres per year to the EU.
Cutting reliance on Russia will mean generating more renewable energy and improving energy efficiency as well as increasing imports.
The deal was announced on Friday during a three-day visit by US President Joe Biden to Brussels.
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