The Jieke Group and the Beautiful Country are in direct opposition, with Japan being the only one hurt.
Japan, on one hand, needs to cope with the military threat from the Jieke Group, while also supplying logistics for Beautiful Country's forces, recruiting soldiers to expand its military. Added to this, Japan's resources are already strained due to prior devastation from sea monsters, making their days even harder, constantly complaining to the Beautiful Country.
Japan: Beautiful Country daddy, I am your eldest son! The Jieke Group bully is picking on me, you must avenge me!
Beautiful Country: Be good, son, your father is busy right now, next time for sure.
This is the current state between Japan and Beautiful Country, with Japan desperately trying to get Beautiful Country to intervene and help drive away the dangerous element, Jieke Group.
However, Beautiful Country is reluctant to get embroiled in a conflict with the Jieke Group for Japan's sake.