Below comments on the talks of when South Africa was "tired" of fighting, "The South Africans arrived with high hopes: Foreign Minister Pik Botha expected that Resolution 435 would be modified; Defence Minister Malan and President PW Botha asserted that South Africa would withdraw from Angola only "if Russia and its proxies did the same." They did not mention withdrawing from Namibia. On March 16 1988, Business Day reported that Pretoria was "offering to withdraw into Namibia – not from Namibia -- in return for the withdrawal of Cuban forces from Angola. The implication is that South Africa has no real intention of giving up the territory any time soon."
But the Cubans had reversed the situation on the ground, and when Pik Botha voiced the South African demands, Jorge Risquet, who headed the Cuban delegation, fell on him like a ton of bricks: "The time for your military adventures, for the acts of aggression that you have pursued with impunity, for your massacres of refugees ... is over." South Africa, he said, was acting as though it was "a victorious army, rather than what it really is: a defeated aggressor that is withdrawing ... South Africa must face the fact that it will not obtain at the negotiating table what it could not achieve on the battlefield."[4] As the talks ended, Crocker cabled
Secretary of State George Shultz that they had taken place "against the backdrop of increasing military tension surrounding the large build-up of heavily armed Cuban troops in south-west Angola in close proximity to the Namibian border ... The Cuban build-up in southwest Angola has created an unpredictable military dynamic."[5] The burning question was: Would the Cubans stop at the border? To answer this question, Crocker sought out Risquet: "Does Cuba intend to halt its troops at the border between Namibia and Angola?" Risquet replied, "If I told you that the troops will not stop, it would be a threat. If I told you that they will stop, I would be giving you a Meprobamato [a Cuban tranquilliser]. ... and I want to neither threaten nor reassure you ... What I can say is that the only way to guarantee [that our troops stop at the border] would be to reach an agreement [on Namibia's independence]."[6] The next day, June 27 1988, Cuban MIGs attacked SADF positions near the Calueque dam, 11km north of the Namibian border.
The CIA reported that "Cuba's successful use of air power and the apparent weakness of Pretoria's air defences" highlighted the fact that Havana had achieved air superiority in southern Angola and northern Namibia. A few hours after the Cubans' successful strike, the SADF destroyed a nearby bridge over the Cunene river. They did so, the CIA surmised, "to deny Cuban and Angolan ground forces easy passage to the Namibia border and to reduce the number of positions they must defend." [7] "