Iran, a predominantly Shia country, was one of the first Muslim countries to provide support for the Bosnian Muslims (Bosniaks, who are mainly Sunni Muslim) in the war. The Islamic Revolutionary Guard Corps (IRGC) sent more than five (5,000 to 14,000 tons from May 1994 to January 1996 alone) thousand tonnes of arms to the Bosnian Muslims. IRGC also supplied trainers and advisers for the Bosnian military and intelligence service. Several dozen Iranian intelligence experts joined the Bosnian Muslim intelligence agency. The Iranian Ministry of Intelligence-supported mujahideen units trained selected Bosnian army units. The Hezbollah (Lebanese Shia), supported by Iran, also sent fighters to the war. In 1992, Iran with the help of Turkey smuggled arms to the Bosnian Muslims. Reports of "hundreds of tons of weapons" shipped from Iran over a period of months appeared in the media in early 1995. Iranian arms were shipped through Croatia. Robert Baer, a CIA agent stationed in Sarajevo during the war, later claimed that "In Sarajevo, the Bosnian Muslim government is a client of the Iranians . . . If it's a choice between the CIA and the Iranians, they'll take the Iranians any day." By the war's end, public opinion polls showed some 86% of the Bosnian Muslim population expressed a positive attitude toward Iran. According to the scholar Cees Wiebes, during the war “Turkey and Saudi Arabia were very willing to deliver weapons and to lure Alija Izetbegović away from Iran, but the orientation of the Bosnian government was far more towards Iran.”
Pakistan's Inter Services Intelligence (ISI) supplied the Bosnian Muslims with arms, ammunition and guided anti-tank missiles. Pakistan defied the UN's ban on supply of arms to the war (declaring it illegal, among other Muslim countries) and ISI airlifted anti-tank guided missiles to the Bosnian Muslims. Pakistan financially aided the Bosnian Muslims.
Saudi Arabiaassisted the Bosnian Muslims with funding, arms and volunteer fighters. Military operations were funded and supported by the Saudi High Commission (SHC), founded by Saudi prince Salman bin Abdul-Aziz. Saudi Arabia provided $300 million in arms supplies (and $500 in humanitarian aid) to the Bosnian government, in violation to the embargo and with the knowing of the United States.
Turkey actively supported the Bosnian Muslims. It assisted Iran with smuggling arms to the Bosnian Muslims. The Turkish line included arms and money also from Saudi Arabia, Malaysia, Brunei and Pakistan. Turkish private individuals and groups financially supported the Bosnian Muslims, and some hundreds of Turks joined as volunteers. Greatest private aid came from Islamist groups, such as the Refah Party and IHH. As a NATO member, Turkey supported and participated in NATO operations, including sending 18 F-16 planes. It was the first of the member countries to call for military intervention, and backed all US calls for engagement, and strongly supported air strikes. It has been noted though, that financial aid from the Turkish government was minimal.
Malaysia supported the Bosnian Muslims through financial aid and arms.
Brunei supported the Bosnian Muslims through financial aid and arms. It officially supported the Bosnian Muslims and spoke against the Bosnian Serbs. It was widely reported that Brunei helped in the purchase and delivery of shipments of small arms.
The United States took no actions against the smuggling of arms, of which they knew. The CIA funded, trained and supplied the Bosnian Army. EU intelligence sources suggested that the US organized arms shipments to Bosnia through Muslim allies. The private military contractor MPRI, approved by the US government, used money provided by pro-Western Islamic countries such as Saudi Arabia, UAE, Kuwait, Brunei and Malaysia to equip the Bosnian army with 46,000 rifles, 1,000 machine guns, 80 APCs, 45 tanks, 840 anti-tank guns and 15 helicopters. The MPRI received $300 million to equip and $50 million to train the Bosnian army.
Russia followed Western policy, but had reservations against some policies, such as NATO air strikes, which it believed was beyond UN resolutions. It tried to moderate anti-Serb decisions in discussions with Western powers. A number of Russian politicians showed solidarity with the Serbs. Hundreds of Russians volunteered on the Serb side.