Passage: During the Cold War, and particularly in the late 1950s, the Soviet Union and People's Republic of China adopted a strategy of destabilisation of Western powers by disruption of their hold on African colonies. Nikita Khrushchev, in particular, viewed the 'underdeveloped third of mankind' as a means to weaken the West. For the Soviets, Africa represented a chance to create a rift between western powers and their colonial assets, and create pro-communist states in Africa with which to foster future relations.Prior to the formation of FRELIMO, the Soviet position regarding the nationalist movements in Mozambique was one of confusion. There were multiple independence movements, and they had no sure knowledge that any would succeed. The nationalist groups in Mozambique, like those across Africa during the period, received training and equipment from the Soviet Union.Eduardo Mondlane's successor, future President of Mozambique, Samora Machel, acknowledged assistance from both Moscow and Peking, describing them as "the only ones who will really help us. ... They have fought armed struggles, and whatever they have learned that is relevant to Mozambique we will use." Guerrillas received tuition in subversion and political warfare as well as military aid, specifically shipments of 122 mm artillery rockets in 1972, with 1600 advisors from Russia, Cuba and East Germany. FRELIMO adopted Marxism-Leninism at an early stage.The Soviet Union continued to support the new FRELIMO government against counterrevolution in the years after 1975. By 1981, there were 230 Soviet,  close to 200 Cuban military and over 600 civilian Cuban advisers still in the country.  Cuba's involvement in Mozambique was as part of a continuing effort to export the anti-imperialist ideology of the Cuban Revolution and forge desperately needed new allies. Cuba provided support to liberation movements and leftist governments in numerous African countries, including Angola, Ethiopia, Guinea-Bissau and Congo-Brazzaville.

Question: when did the powers plan to disrupt the western colonies
late 1950s