What China's objectives? Are you illiterate?
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China did show support to Cambodia by launching the attack. That is the mission. However US mission was complete hostile take over of Vietnam even if it means genocide the Viets with the deployment of WMD such as Agent Orange and not to forget the continuous bombings all over Vietnam and turning Viets into BBQ with Napalm. US main objective was kill all Viets necessary if they are obstructing US mission. But after 20 years US gave up, guess you guys got scared, tired, weak after staying for so long in the jungle and came to the conclusion those Viets are like cockroaches just can't wipe them out.
LOL!!!!!!!! That was their objective? Just attack Vietnam and pull out? That didn't achieve anything buddy. And you are the one that is illiterate if that was their only objective.
If you going to use that source, show the whole thing at least.
The Chinese entered northern Vietnam and captured some of the cities near the border. On March 6, 1979, China declared that the gate to Hanoi was open and that their punitive mission had been achieved. Chinese forces retreated back across the Vietnamese border into China. Both China and Vietnam claimed victory in the last of the Indochina Wars of the 20th century; as Vietnamese troops remained in Cambodia until 1989, it can be said that China failed to achieve the goal of dissuading Vietnam from involvement in Cambodia. Following the dissolution of the Soviet Union, the Sino-Vietnamese border was finalized.