Maintaining the balance of power requires active cooperation of global powers over the containing or distributing power.
Japan is one of few world powers that lost the ability for active cooperation in forming global balance of power because of facing China and especially North Korea challenges. Keep this logic in mind, the winner cart of the U.S. in the World War II and the Cold War, was the distance from the scene, which was Europe. It is evident that as long as Japanese are concerned about the regional threat of North Korea, they have to impose some considerations to their international relations in favor of China, Russia and the US, which leads to a semi-passive foreign policy from Tokyo. In spite of that, the position of Japan toward Ukraine Crisis in 2014 was decisive.
The winner of managing the North Korean crisis have been Russia and China since it made them able to use North Korea as a leverage for restraining Japan. So the crisis must be settled.
In this respect, as the first step the system must initiate two tripartite and quartet talks: 3-party talks between Tokyo, Seoul and the System and 4-party talks including Pyongyang.