The Manchuria and Abyssinia crises severely damaged the perception of the League of Nations in Europe. The League's inability to prevent aggression and enforce its own resolutions against Japan and Italy was seen as a sign of its ineffectiveness. European nations, particularly Britain and France, began to lose faith in the League as a means of maintaining peace. This diminishing confidence in the League contributed to the adoption of appeasement policies towards aggressive nations, as European powers sought to avoid conflict through bilateral negotiations and concessions. The crises thus undermined the League’s authority and credibility, making it increasingly irrelevant in the face of rising tensions in Europe.

The Italian invasion of Abyssinia in 1935 had significant consequences for African nations. It shattered the illusion of security and protection that smaller, independent nations expected from the League of Nations. The invasion demonstrated that colonial ambitions of European powers were still prevalent and that African sovereignty could be easily compromised. It also led to a sense of disillusionment and betrayal among African leaders and populations, as the League's failure to protect Abyssinia – a member state – highlighted the racial double standards in international relations. This event spurred nationalist and independence movements in other African countries, as it became clear that self-reliance was essential for true sovereignty.

The Abyssinia Crisis significantly affected Italy's international relations, particularly with Britain and France. Initially, both Britain and France were members of the League of Nations and were expected to support sanctions against Italy. However, their response was marred by the secret Hoare-Laval Pact, which proposed giving Italy control over large parts of Abyssinia. This pact, when leaked, caused public outcry and damaged the credibility of both Britain and France. The crisis pushed Italy closer to Nazi Germany, as Mussolini felt betrayed by the Western powers' unwillingness to support his colonial ambitions fully. This realignment of alliances was a critical step towards the formation of the Axis Powers in World War II.

The international community's reaction to the Japanese invasion of Manchuria was marked by condemnation but lacked concrete action. The League of Nations condemned Japan's actions and set up the Lytton Commission to investigate the situation. However, the report, which criticised Japan, took over a year to complete and was largely ignored by the Japanese. Major powers, including Britain and the United States, expressed their disapproval but were reluctant to take strong action, largely due to their economic interests in Japan and a desire to avoid military conflict. This passive response emboldened Japan and highlighted the limitations of the League of Nations.

Japan's decision to invade Manchuria in 1931 was driven by several factors. Firstly, Japan faced severe economic difficulties during the Great Depression, which led to a desire to secure natural resources and markets for its industries. Manchuria was rich in resources like iron ore and coal. Secondly, Japan's growing population needed living space, and Manchuria offered a solution. Thirdly, there was a strong nationalist and militarist sentiment in Japan that favoured expansionism. Lastly, Japan perceived China's internal instability as an opportunity to assert its dominance in the region, believing that Western powers were too preoccupied with their own economic problems to intervene.