(Reuters) – Sempra Energy (NYSE:) said on Monday it would sell three million tonnes of liquefied each year to Polish Oil & Gas Co , in another sign of rising interest in U.S. supplies following Russia’s invasion of Ukraine.

In recent months, as Russia’s sanctions continue to impede natural gas imports from Russia, many buyers have switched to U.S. LNG due to the tightening of supplies in a market already short on this product.

With more than 12 billion cubic feet of LNG delivered daily, the United States will be the largest exporter of LNG in the world.

Sempra will provide Polish Oil & Gas with LNG for 20 years under the deal. Sempra would supply approximately 2 2 Million Tonnes of Liquefied Natural Gas per Annum from its Cameron LNG Phase 2 Project in Louisiana. The rest of the LNG would be supplied by the Port Arthur LNG project, Texas.

Polish Oil & Gas will also have the option in 2022 to reallocate volumes from the Cameron Phase 2 project to the Port Arthur project, Sempra said in a statement.