According to the agency, Pompeo told a security conference in Munich that the move is part of a US drive to increase Europe's energy independence from Russia.
Pompeo was also quoted by IAR as saying that his country wants to boost the region's private investments in the energy sector.
The Polish-led Three Seas Initiative aims to boost infrastructure, energy and economic cooperation among 12 countries between the Black, Baltic and Adriatic Seas.
The initiative brings together Poland, Austria, Bulgaria, Croatia, the Czech Republic, Estonia, Lithuania, Latvia, Romania, Slovakia, Slovenia and Hungary.
Listen to an audio report by Michał Owczarek by clicking on the ‘play’ button