维基百科上说苏联没出兵的原因有两个：

While the Soviet Union deployed naval vessels and supplied materiel to Vietnam, they felt that there was simply no way that they could directly support Vietnam against China; the distances were too great to be an effective ally, and any sort of reinforcements would have to cross territory controlled by China or U.S. allies.^{[citation needed]} The only realistic option would be to restart the unresolved border conflict with China.^{[citation needed]} Vietnam was important to Soviet policy but not enough for the Soviets to go to war over.^[82]When Moscow did not intervene, Beijing publicly proclaimed that the Soviet Union had broken its numerous promises to assist Vietnam.

Another reason why Moscow did not intervene was because Beijing had promised both Moscow and Washington that the invasion was only a limited war, and that Chinese forces would withdraw after a short incursion. After moderation by the U.S., Moscow decided to adopt a "wait and see" approach to see if Beijing would actually limit their offense. Because Vietnam's anti-air capabilities were among the best in the world at the time and in order to reassure Moscow it was conducting a limited war, Deng Xiaoping ordered the Chinese navy and air force to remain out of the war; only limited support was provided by the air force.^[83]When Beijing kept its promise, Moscow did not retaliate.

 

所有跟帖： 

• 对越反击战解放军没有空中支援匪夷所思，也是一场奇怪的战争。 -少壮军人- ♂ (0 bytes) () 05/24/2023 postreply 10:38:15

• 当年解放军空中力量弱。苏联在越南沿海部署了15艘战舰都有防空系统，同时，苏联也援助越南大量个人肩扛防空导弹。 -delta2020- ♂ (0 bytes) () 05/24/2023 postreply 10:57:45

• 空对地支援（close air support)是解放军的弱点，当年没有武装直升飞机和类似美国A10那样的支援飞机， -delta2020- ♂ (196 bytes) () 05/24/2023 postreply 11:05:44

• 您忘记了强5 -少壮军人- ♂ (0 bytes) () 05/24/2023 postreply 11:22:22

• 强5低空低速性能不好，支援地面部队作战非常困难。单独攻击敌方目标还行。 -delta2020- ♂ (0 bytes) () 05/24/2023 postreply 11:37:55

• 苏联打下中国得不丧失。 -chufang- ♀ (0 bytes) () 05/24/2023 postreply 12:03:37