Does Russia provide a 'faster' arms option to Iraq than the U.S.?

Russia is presenting as a faster, more flexible arms option for Iraq as Prime Minister Haidar al-Abadi travels to Moscow to seek urgent military support against ISIS. Al-Abadi's visit comes as ISIS presses toward Ramadi, with Iraqi experts noting the need for rapid relief that the United States has struggled to provide. Moscow is seen by some as able to offer light and medium weapons on a quicker timetable with more forgiving payment terms than Washington. Biden told Abadi in a May 15 call that U.S. shipments would be expedited, though Baghdad says deliveries remain too slow.