No, Japan knows its limit as being a nation without no resources except farmland to grow foods and sea areas to catch fish.Japan is an US slave which doesn't have independent foreign policy, US can bend Japan's will and order Japan to hurt itself at US will, but US can do nothing about China, China will never hurt herself just to please US.
Japan is a maritime country that cannot survive without exporting finished goods to other countries, especially the USA, and buying raw materials and fuels from abroad in exchange.
So, in essence, what you say slavery is actually a policy of not cutting the tree branch on which Japan sits. Japan's policy is very pragmatic that will not cause its fall.
The present Japanese govt does not allow ultranationalism to grow to a point that may cause conflict with Asian countries, especially with China as it did after the 1900s.
So, it always acts prudently in order to balance the order around it.