Six Day War

During the Cold War the two superpowers, America and the Soviet Union never actually fought a direct battle. Rather, they fought proxy wars which are wars in which two parties don't directly participate. They aid other countries to do the fighting on their behalf.

    That is essentially what the Six-Day War was. The United States sent both economic and military aid to the Israelis in order to promote a balance of power in the region. As a result, the Soviets sent aid to the Arab nations. But before we get into the war it is important to understand the relations in the Middle East. The majority of Israelis are Jewish. In every other Middle Eastern country, the majority of people are followers of Islam.
    Therefore, fighting amongst the two groups was common. They had conflicting religious beliefs. In 1948, the Israelis had repelled the Arab invaders in the bloody Israeli-Arab War. After that, there were multiple incursions between the countries. In 1967 the Israelis shot down six Syrian MiG aircraft. The Egyptian President Nasser pledged military aid to the Syrians in case of another attack. Additionally, the Soviets sent military aid and intelligence the both the Syrians and Egyptians. They informed Nasser that Israeli troops had grouped up on the Syrian border which caused Nasser to mobilize his forces and ask the United Nations General Thant to remove security forces from the Sinai Penninsula. As soon as that happened they blockaded the Straits of Tiran preventing supplies from reaching Israel. Jordan and Egypt signed a Mutual Defense Pact. The United States demanded that the Arabs free the straits but they didn't. Israel was alone and surrounded on all sides. They had no choice but to attack. On June 5th, 1967 Israel launched a massive air attack and massacred the Egyptian air force and on land, the defense forces quickly crushed the Arab coalition forces. By June 11th it was over the Arabs had been completely overwhelmed. The Israelis had seized an incredible amount of land from the Arabs. As for peace negations, the US and Soviets were able to get the countries to agree on Resolution 242. It stated that Israeli would withdraw from captured territories in return for peace. This war was just one of many proxy wars fought during the Cold War. Often times these wars left the countries in worse states than they had been. Based on the information it is up to you to decide whether or not it was right for Israel to attack the Arabs.

https://www.jewishvirtuallibrary.org/u-s-state-department-summary-of-the-six-day-war

http://www.sixdaywar.org/content/usa.asp

https://www.britannica.com/event/Six-Day-War

https://mfa.gov.il/mfa/aboutisrael/maps/pages/events%20leading%20to%20the%20six%20day%20war-%201967.aspx