During the Cold War, there were indeed some historical events that were deliberately concealed or distorted, which affected the understanding of international relations. Here are some examples: 1. **Propaganda and Reality of the Vietnam War**: Information released by the US government during the Vietnam War was often packaged to support the legitimacy of the war. Air bombing such as Operation Rolling Thunder and civilian casualties caused by operations conducted by US troops in Vietnam were often not fully reported, which led to public misunderstanding of the nature of the war. 2. **Operation Gladio**: This was a secret operation during the Cold War that involved intelligence agencies in Italy and other European countries to counter possible communist influence. This plan was not revealed until the end of the Cold War, affecting the understanding of the security and political situation in Europe. 3. **Cuban Missile Crisis**: A lot of information about the Cuban Missile Crisis was not transparent at the time, and the decision-making process and political considerations behind the decision-making process of both the United States and the Soviet Union were not fully disclosed to the public, which led to the subsequent historical interpretation and understanding of the motivations of the Cold War. 4. **Soviet historical revisionism**: The Soviet Union’s revision and re-narration of historical events during the Cold War, including its interpretation of the Soviet Union’s relationship with Germany during World War II and the purges during the Stalin era, have affected Western countries’ perception and understanding of the Soviet Union. 5. **China-Soviet relations**: During the Cold War, China-Soviet relations experienced a change from cooperation to confrontation, but the true dynamics of this relationship and its impact on international relations have been deliberately simplified or distorted in many cases, especially in the narratives of Western countries. 6. **Causes of the Korean War**: There are different narratives about the causes of the Korean War and the roles of the parties in the war, especially in the propaganda of the United States and the Soviet Union, which has led to a deviation in the understanding of the root causes of the war. The concealment or distortion of these events not only affected international relations at the time, but also had a long-term impact on the study and understanding of subsequent history.