Zambia tributaries rise in Angola's central highlands. The edge of the Cuando River floodplain (not its main channel) forms Zambia's southwestern border, and via the Chobe River that river contributes very little water to the Zambezi because most is lost by evaporation. Two of the Zambezi's longest and largest tributaries, the Kafue and the Luangwa, flow mainly in Zambia. Their confluences with the Zambezi are on the border with Zimbabwe at Chirundu and Luangwa town respectively. Before its confluence, the Luangwa River forms part of Zambia's border with Mozambique. From Luangwa town, the Zambezi leaves Zambia and flows into Mozambique, and
Russia–Zambia relations state visits in 1974 and 1987. Relations between the two countries soured in 1976, when Kaunda said on the Soviet and Cuban presence in Angola, "(t)hey drove colonialism and fascism out the front door, only to let a plundering tiger and its cubs in the back door." Soviet support for the Zimbabwe African People's Union, which operated primarily out of Zambia, helped to stop relations from detiorating further, and ties became warmer after Abel Muzorewa, the Prime Minister of Zimbabwe Rhodesia launched airstrikes inside Zambia in 1979. After the strikes, Zambia unsuccessfully sought Western military aid, which saw Zambia turning