The Amin government, having secured a treaty in December 1978 that allowed them to call on Soviet forces, repeatedly requested the introduction of troops in Afghanistan in the spring and summer of 1979. They requested Soviet troops to provide security and to assist in the fight against the mujaheddin rebels. After the killing of Soviet technicians in Herat by rioting mobs, the Soviet government sold several Mi-24 helicopters to the Afghan military, and increased the number of military advisers in the country to 3,000. On April 14, 1979, the Afghan government requested that the USSR send 15 to 20 helicopters with their crews to Afghanistan, and on June 16, the Soviet government responded and sent a detachment of tanks, BMPs, and crews to guard the government in Kabul and to secure the Bagram and Shindand airfields. In response to this request, an airborne battalion, commanded by Lieutenant Colonel A. Lomakin, arrived at the Bagram Air Base on July 7. They arrived without their combat gear, disguised as technical specialists. They were the personal bodyguards for General Secretary Taraki. The paratroopers were directly subordinate to the senior Soviet military advisor and did not interfere in Afghan politics. Several leading politicians at the time such as Alexei Kosygin and Andrei Gromyko were against intervention.