12 U.S. Code § 3904 - Reserves
(a) Establishment and maintenance of special reserves
(1) Each appropriate Federal banking agency shall require a banking institution to establish and maintain a special reserve whenever, in the judgment of such appropriate Federal banking agency—
(A) the quality of such banking institution’s assets has been impaired by a protracted inability of public or private borrowers in a foreign country to make payments on their external indebtedness as indicated by such factors, among others, as—
(i) a failure by such public or private borrowers to make full interest payments on external indebtedness;
(b) Accommodation of potential losses on foreign loans by United States banks
The appropriate Federal banking agencies shall analyze the results of foreign loan rescheduling negotiations, assess the loan loss risk reflected in rescheduling agreements, and, using the powers set forth in section 3907 of this title (regarding capital adequacy), ensure that the capital and reserve positions of United States banks are adequate to accommodate potential losses on their foreign loans.