I think it was necessary for China to send troops to North Korea at that time. The invaders have already arrived at the gate of China, and their lips are dead and their teeth are cold. To aid North Korea is to defend the country. Of course, China was poor and weak at that time and needed to recuperate, so the decision of the top leader was very difficult and painful. As a result of the war, Korea returned to the invincible state before the war. China fought against the invaders and safeguarded the dignity of the motherland and territorial security, but it also paid a heavy price, which greatly affected economic construction. More seriously, the problem in Taiwan Province Province has been stranded since then. Therefore, the war is cruel, and neither side of the war can simply summarize it with victory or defeat. Although we are not afraid of war, we prefer peace.