The Eastern Flank Strategic Partnership Act of 2025 aims to enhance defense cooperation between the United States and its NATO allies located on the Eastern Flank, which includes countries like Bulgaria, Estonia, Finland, Hungary, Latvia, Lithuania, Poland, Romania, and Slovakia. The main goal is to strengthen regional security against potential threats from Russia and Belarus, especially in light of ongoing conflicts involving Ukraine. Key provisions of the Act include a commitment to prioritize defense cooperation with these Eastern Flank allies.