Japanese invasion of French Indochina
Following the Japanese invasion of French Indochina, the U.S. enacted an oil and steel embargo against Japan in August 1941, and China was included in the Lend-Lease Act which superseded the Sino-Soviet Non-Aggression Pact of 1937. As the Battle of Chonqing-Chengdu continued into 1941 with "Operating 102", the Japanese began preparations for "Operation Z"; the attack plan on Pearl Harbor. In the latter half of the Sino-Japanese War.