28 U.S.C. § 1607 - U.S. Code - Unannotated Title 28. Judiciary and Judicial Procedure § 1607. Counterclaims

(a) for which a foreign state would not be entitled to immunity under section 1605 or 1605A of this chapter had such claim been brought in a separate action against the foreign state; or

(b) arising out of the transaction or occurrence that is the subject matter of the claim of the foreign state; or

(c) to the extent that the counterclaim does not seek relief exceeding in amount or differing in kind from that sought by the foreign state.