22 U.S.C. § 610

“The Congress endorses efforts by the United States to modernize the defense capability of Poland, Hungary, the Czech Republic, Slovenia, and any other countries designated by the President pursuant to section 203(d) of the NATO Participation Act of 1994 [Pub. L. 103–447, set out in a note below], by exploring with such countries options for the sale or lease to such countries of weapons systems compatible with those used by NATO members, including air defense systems, advanced fighter aircraft, and telecommunications infrastructure.