Passage: Some Burmese nationalists saw the outbreak of World War II as an opportunity to extort concessions from the British in exchange for support in the war effort. Other Burmese, such as the Thakin movement, opposed Burma's participation in the war under any circumstances.  Aung San with other Thakins founded the Communist Party of Burma (CPB) in August 1939. Aung San also co-founded the People's Revolutionary Party (PRP), renamed the Socialist Party after World War II. He was also instrumental in founding the Freedom Bloc by forging an alliance of  Dobama Asiayone, ABSU, politically active monks and Ba Maw's Poor Man's Party.After Dobama Asiayone called for a national uprising, an arrest warrant was issued for many of the organisation's leaders including Aung San, who escaped to China.  Aung San's intention was to make contact with the Chinese Communists but he was detected by the Japanese authorities who offered him support by forming a secret intelligence unit called the Minami Kikan, headed by Colonel Suzuki with the objective of closing the Burma Road and supporting a national uprising.Aung San briefly returned to Burma to enlist twenty-nine young men who went to Japan with him to receive military training on Hainan, China, and they came to be known as the "Thirty Comrades". When the Japanese occupied Bangkok in December 1941, Aung San announced the formation of the Burma Independence Army (BIA) in anticipation of the Japanese invasion of Burma in 1942.For Japan's military leadership, the conquest of Burma was a vital strategic objective upon the opening of hostilities with Britain and the United States.  Occupation of Burma would interrupt a critical supply link to China.  Also, the Japanese knew that rubber was one of the few militarily vital resources that the United States was not self-sufficient in.  It was thought critical that the Allies be denied access to Southeast Asian rubber supplies if they were ever to accept peace terms favourable to Japan.

Question: What did the Thakin movement oppose?
Burma's participation in the war