Under an agreement with which of the following countries did Subhash Chandra Bose organise the Indian soldiers into Azad Hind Fauj?

The Provisional Government of Free India, or, more simply, Free India (Azad Hind), was an Indian provisional government established in occupied Singapore in 1943 and supported by the Empire of Japan, Nazi Germany, Italian Social Republic, and their allies.

It was a part of a political movement originating in the 1940s outside India with the purpose of allying with the Axis powers to free India from British Rule. It was established by Indian nationalists-in-exile during the latter part of the Second World War in Singapore with monetary, military and political assistance from Imperial Japan. Founded on 21 October 1943, the government was inspired by the concepts of Subhas Chandra Bose who was also the leader of the government and the Head of State of this Provisional Indian Government-in-exile. The government proclaimed authority over Indian civilian and military personnel in Southeast Asian British colonial territory and prospective authority over Indian territory to fall to the Japanese forces and the Indian National Army during the Japanese thrust towards India during the Second World War. The government of Azad Hind had its own currency, court and civil code, and in the eyes of some Indians its existence gave a greater legitimacy to the independence struggle against the British.

However, while it possessed all the nominal requisites of a legitimate government, it lacked large and definite areas of sovereign territory until Japan gave it nominal authority of the Andaman and Nicobar Islands in 1943 and the occupation of parts of Manipur and Nagaland. Japanese officials made all the decisions, and throughout its existence it was entirely dependent on Japanese support.

Immediately after the formation of the government-in-exile, Azad Hind declared war against the Anglo-American allied forces on the Indo-Burma Front. Its army, the "Azad Hind Fauj" (Indian National Army or the INA), went into action against the British Indian Armyand the allied forces as part of the Imperial Japanese Army in the Imphal-Kohima sector. The INA had its first major engagement at the Battle of Imphal where, under the command of the Japanese Fifteenth Army, it breached the British defences in Kohima, reaching the salient of Moirang before suffering a catastrophic defeat as the Allied forces held, and Allied air dominance and compromised supply lines forced both the Japanese and the INA to retreat.