 It was agreed that no Chinese combat troops would enter North Vietnam unless the United States invaded North Vietnam, but that China would send support troops to North Vietnam to help maintain the infrastructure damaged by American bombing.There was a deep distrust and fear of China within the North Vietnamese Politburo, and the suggestion that Chinese troops, even support troops, be allowed into North Vietnam, caused outrage in the Politburo.Ho had to use all his moral authority to obtain the Politburo's approval.