It depends on who the Japanese people are fighting against and what they're fighting for.
They did.
Japan used it's conquered territories to support their war efforts. Labor, raw materials, sea ports, airfields, etc.
Yes, all of those had a role. China in support of North Korea and the US and Japan in support of South Korea.
Korea was occupied by Japan, and as with other occupied territories, they supplied Japan with labor to support the war effort.
because japan was a good allie and they were friends of russia. they had mated before and felt they were obliged to help each other.
First to support the British war effort against Germany, then to defend itself against the threat of Japan.
The U.S. supported western Europe and Japan after WW II
Because Japan only had enough oil in their reserves to support a 2 year war.
The occupied Asian countries now had to provide labor to support the Japanese war machine.
If you mean who Germany's allies were. Japan, Austria, and spain were their biggest allies.
The Flying Tigers , though piloted by Americans , were part of the Chinese air-force which was at war with the Japanese . The 1st American Volunteer Group was a means by which the America government (not yet at war with Japan )could support the Chinese in their war with Japan without being directly associated with the AVG - plausible deniability .
China was already at war with Japan when the UK and France declared war on Germany in September 1939. The Chinese welcomed western support to defeat the Japanese.