The Ogaden war between Ethiopia and Somalia (1977-1978): Russians and Cubans come into war and change the fate
(Go on) Thus began a massive airlift to supply the troops on the ground. From 25 November 1977 several hundred Soviet military transport planes made shuttle transporting practically any kind of weapons and military systems: military aircraft tanks, passing through the artillery. At the same time came in Ethiopia 18000 Cuban soldiers, 2000 men of southern Yemen and 1500 Russian military advisers.
Source: Defense Online