Global leadership can no longer be defined by the size of a nation's military or upon its military budget. Although these two long-standing aspects have reigned as benchmarks to world leadership in the past, current affairs and conditions demand a new reasoning.
Therefore, modern global leadership, it would seem, is now more than ever dependent upon the rationalness of a state's leadership, its steadiness, its commitment and adherence to international pacts and treaties, its successes at developing, improving and sustaining higher standards of living for its people and the wider world and its protection of the environment.
In other words, non-environmentalist nations cannot be world leaders. Declining states cannot be world leaders. Isolationist states cannot be global leaders. States with constricting global investments cannot be world leaders. And states with impulsive reactionary leaders are also doomed from world leadership.
Clearly, the states that have signed onto international agreements to better the human and Planetary conditions and those committed in spearheading such efforts, epitomize world leadership. So are the states leading the efforts to resettle millions of the world's displaced people.
Global leadership has been transformed from the days of the "Sea Power Theory". Leadership must now be defined by a nation's actions to cohesively better its people and those of the wider globe along with its protection of the fragile environment on Planet Earth.