This factor complicated convincing Najibullah to agree to the Geneva Accords, but he was eventually placated by Soviet promises to dramatically expand aid and assistance measures post-withdrawal. Although the USA was not bound under the Geneva Accords to cease its military aid, Pakistan (through which this aid flowed) was obligated to prevent cross-border armament flows to Afghanistan (Kalinovsky 149). On April 14, 1988 the Geneva Accords were signed between Pakistan and Afghanistan, with the USSR and US acting as guarantors, stating provisions for the withdrawal of Soviet forces and mutual non-interference between Pakistan and Afghanistan.