Mobutu accused the MPLA, Cuban and Soviet governments of complicity in the war. While Neto did support the FNLC, the MPLA government's support came in response to Mobutu's continued support for Angola's FNLA. The Carter Administration, unconvinced of Cuban involvement, responded by offering a meager $15 million-worth of non-military aid. American timidity during the war prompted a shift in Zaire's foreign policy towards greater engagement with France, which became Zaire's largest supplier of arms after the intervention. Neto and Mobutu signed a border agreement on 22 July 1977.